AIMS is a multi-state first-principles dynamics program written by
Benjamin G. Levine, Joshua D. Coe, Aaron M. Virshup, Hongli Tao, Christian R. Evenhuis, William J. Glover, Toshifumi Mori, Michal Ben-Nun and Todd J. Martinez.
Bibliography:
B. G. Levine, J. D. Coe, A. M. Virshup and T. J. Martinez, Chem. Phys. 347, 3 (2008).
M. Ben-Nun and T. J. Martinez, Chem. Phys. Lett. 298, 57 (1998).
All publications resulting from use of this program must acknowledge the above. See also:
B. G. Levine and T. J. Martinez, J. Phys. Chem. A 113, 12815 (2009).
T. J. Martinez, Acc. Chem. Res. 39, 119 (2006).
The AIMS module implements the Ab Initio Multiple Spawning method to perform dynamics calculations on multiple electronic states. Although the program was designed for non-adiabatic dynamics with CASSCF wavefunctions, it can be used quite generally for first principles molecular dynamics, provided that nuclear gradients are available.
AIMS provides a description of a time-evolving molecular wavepacket with a multi-configurational, product gaussian function basis. To allow the size of the basis set to remain small while describing the wavepacket dynamics, the centers of the full-dimensional gaussian functions follow classical trajectories while their widths are kept fixed (the frozen Gaussian approximation). When these classical trajectories encounter regions of large non-adiabatic coupling to another electronic state, new basis functions are spawned on the coupled state and the Time Dependent Schrödinger Equation is solved in order to describe population transfer between the electronic states. In this way, the description of the wavepacket can be systematically improved by increasing the number of initial trajectory basis functions, while reducing the coupling threshold at which trajectories spawned. Alternatively, spawning can be disabled, and the method will reduce to traditional first-principles classical molecular dynamics when a single trajectory basis function is used.
AIMS is compiled as a component of Molpro; however, it requires a fortran 2003 compiler and is disabled unless the preprocessor variable MOLPRO_f2003 is defined, which depends on the version of your compiler.
The AIMS program is controlled by the Molpro input deck and a number of external text files:
The AIMS program is invoked by the command AIMS. The details of the electronic structure are defined in specifically named procedures. At a minimum, for first principles dynamics, AIMS requires the following structure to the input deck:
SYMMETRY, nosym
ORIENT, noorient
GEOMTYP=xyz
GEOMETRY={ Initial atom specifications. Must match ordering of Geometry.dat, but need not be the same geometry }
BASIS={Basis specifications.}
MPINIT={ Electronic structure routines for initial wavefunction }
MPCALC={ Electronic structure routines for dynamics calculations. At a minimum, must include: ener(1)=energy(1) ener(2)=energy(2)etc force }
AIMS,dir
where
dir (string) Relative directory to AIMS input files. (Default is working directory).Note: the above is appropriate only for first-principles dynamics (without spawning). CASSCF spawning calculations require additional procedures and a specific structure to the MPINIT and MPCALC procedures. See the examples in section examples.
Control.dat is a fortran NAMELIST file storing the main parameters (in au) of an AIMS simulation. At the end of the file, one can optionally specify user-defined atom types (see below). Also time steps are in au, 1 au = 0.0241888 femtoseconds.
| Initialization | ||
|---|---|---|
| Parameter | Options (Default) | Description |
| Required parameters: | ||
NumStates | Integer | Number of electronic states. |
InitState | Integer | Initial electronic state. |
NumParticles | Integer | Number of atoms. |
| Common parameters: | ||
IMethod | 0 | First principles dynamics (No NACV). |
(1) | CASSCF dynamics, with NACV. | |
IRestart | (0)/1 | Restart the calculation when set to 1. |
RestartTime | Real (-100.0) | Time from which to restart in Checkpoint.txt. If disabled, use Last_Bundle.txt. |
IRndSeed | Integer (0) | Initial condition random number seed. |
InitialCond | ('NoSample') | Read initial conditions from Geometry.dat. |
'Wigner' | Sample from the Wigner distribution of harmonic normal modes in Frequencies.dat. | |
'Quasiclassical' | As above, for the Quasiclassical distribution. | |
'Boltzmann' | As above, for the Boltzmann distribution. | |
Temperature | Real (0.0) | Temperature (Kelvin) of the initial conditions. |
| Expert parameters: | ||
InitBright | Logical (.false.) | Select optically brightest of InitState and IDark as initial state. |
InitDark | Logical (.false.) | As above, but for darkest state. |
IDark | Integer (-1) | See above. |
InitGap | Real (0.0) | Select initial ground-excited energy gap to within $\pm 0.5\times$InitGapWidth. |
InitGapWidth | Real (0.0) | See above. |
IRestartTraj | Integer array (0) | Subset of trajectories to restart from. Can restart a single dead trajectory. |
NumInitBasis | Integer (1) | Number of initial coupled basis functions. |
FirstGauss | Logical (.false.) | Place the first basis function at the molecular origin (that of Geometry.dat), with zero momentum. |
MirrorBasis | Logical (.false.) | Mirror the initial basis on another electronic state, MirrorState. |
MirrorState | Integer (1) | See above. |
EnergyAdjust | Logical (.false.) | Adjust momenta of mirrored basis (along NACV) to match original basis energy. |
SharpEnergy | Logical (.false.) | Adjust momenta of all initial basis functions to match first basis function energy. |
| Integration and numerics | ||
|---|---|---|
| Parameter | Options (Default) | Description |
| Required parameters: | ||
TimeStep | Real | Simulation timestep. |
SimulationTime | Real | Simulation length. |
| Common parameters: | ||
ExShift | Real (0.0) | Apply a shift of +ExShift to diagonals of Hamiltonian to improve amplitude/phase propagation. Good choice is average potential energy of ground and excited states. |
CoupTimeStep | Real (TimeStep/4) | Timestep to use in regions of large nonadiabatic coupling. |
| Expert parameters: | ||
TimeStepRejection | Logical (.true.) | Enables adaptive time-stepping when encountering integration problems. |
MinTimeStep | Real (CoupTimeStep/4) | Minimum timestep to use when adaptive time-stepping. |
DieOnMinStep | Logical (.true.) | Stop calculation if minimum timestep is reached. |
EnergyStepCons | Real (0.005) | Allowed violation of classical energy conservation before timestep is rejected. |
NormCons | Real (0.25) | Permitted deviation in Norm from beginning of simulation. |
RejectAllStateFlip | Logical (.true.) | Reject a timestep if any two electronic states flip. If .false. then only reject if state is coupled to occupied state. |
OlapThresh | Real (0.001) | Threshold overlap between two trajectories below which matrix elements not calculated. |
RegThresh | Real (0.0001) | Threshold to regularize the overlap matrix before inversion. |
Constrain | Logical (.false.) | Apply geometric constraints? If yes, supply Constraints.dat |
| Spawning | ||
|---|---|---|
| Parameter | Options (Default) | Description |
| Common parameters: | ||
CSThresh | Real (0.1) | Threshold Coupling, above which to spawn. |
PopToSpawn | Real (0.1) | Minimum population a trajectory must have before it can spawn. |
OMax | Real (0.8) | Prevent spawning if overlap of spawned trajectory with existing basis greater than Omax. |
MaxTraj | Real (100) | Maximum number of allowed trajectories. Above which, spawning is disabled. |
IgnoreState | Integer (0) | Stop dynamics of trajectories on IgnoreState. if not coupled for at least DecoherenceTime. Choose 1 if only interested in excited states. |
MaxEDiff | Real (0.03) | Energy gap threshold for calculating nonadiabatic couplings, above which, coupling taken to be zero. |
| Expert parameters: | ||
DecoherenceTime | Real (200.0) | See above. |
SpawnCoupV | Logical (.false.) | Use Coup.velocity as criterion for spawning rather than Coupling magnitude alone. |
EShellOnly | Logical (.true.) | Require spawned trajectories to have same classical energy as parent by adjusting momentum along NACV. |
| Output | ||
|---|---|---|
| Parameter | Options (Default) | Description |
| Common parameters: | ||
zAllText | Logical (.false.) | Write all output files? |
zEDatFile | Logical (.true.) | Write Energy file? |
zNDatFile | Logical (.true.) | Write Population file? |
zTrajFile | Logical (.false.) | Write Trajectory files? |
zAmpFile | Logical (.false.) | Write Amplitude files? |
zPotEnFile | Logical (.false.) | Write Potential Energy files? |
zXYZ | Logical (.false.) | Write XYZ Geometry files? |
zCoupFile | Logical (.false.) | Write Coupling files? |
zChargeFile | Logical (.false.) | Write Charge files? |
zDipoleFile | Logical (.false.) | Write Dipole files? |
zTDipoleFile | Logical (.false.) | Write Transition Dipole files? |
zQMRRFile | Logical (.false.) | Write $\langle r^2 \rangle$ quadrupole moment files? |
zCIVecFile | Logical (.false.) | Write CI Vector files? (Not recommended for large CI) |
zCorrfile | Logical (.false.) | Write Correlation function file? |
zBundMatFile | Logical (.false.) | Write Matrices (H, S, etc)? |
WriteMolden | Logical (.false.) | Write Molden files? |
MoldenStep | Integer (200) | How often (every number of timesteps) Molden files are written. |
RestartStep | Integer (4) | How often (every number of timesteps) Restart files are written. |
| Expert parameters: | ||
NStepToPrint | Integer (1) | How often (every number of timesteps) output files are written. |
WriteEveryStep | Logical (.true.) | Write output every timestep, including subtimesteps of adaptive propagation. Overrides NStepToPrint. |
NBonds | Integer (0) | Number of bond lengths to print. Define IBond below. |
IBond(2,NBonds) | Integer (0) | List of atom indices that are bonded. See NBonds above. |
NAngles | Integer (0) | Number of bond angles to print. Define IAngle below. |
IAngle(3,NAngles) | Integer (0) | List of atom indices that define bond angles. |
NDihedrals | Integer (0) | Number of dihedral angles to print. Define IDihedral below. |
IDihedral(4,NDihedrals) | Integer (0) | List of atom indices that define dihedral angles. |
NPyrams | Integer (0) | Number of pyramidalization angles to print. Define IPyram below. |
IPyram(4,NPyrams) | Integer (0) | List of atom indices that define pyramidalization angles. |
User-defined atom types
AIMS recognizes the atoms H, C, N, O, S, F, Cl and assigns appropriate masses and gaussian width parameters for these atoms. If you wish to modify these defaults, or if your system contains other atoms, you can define custom atom types at the end of Control.dat. The format is (in atomic units):
n
AtomName(1) AtomicNumber(1) AtomicMass(1) GaussianWidth(1)
$\vdots$
AtomName(n) AtomicNumber(n) AtomicMass(n) GaussianWidth(n)
Geometry.dat contains the molecular geometry that will be used in the generation of initial conditions. Optionally, the momenta can also be specified, which is useful if
InitialCond='NoSample':
UNITS=ANG or UNITS=BOHR
natom
AtomName(1) x(1) y(1) z(1)
$\vdots$
AtomName(natom) x(natom) y(natom) z(natom)
Momenta:
AtomName(1) px(1) py(1) pz(1)
$\vdots$
AtomName(natom) px(natom) py(natom) pz(natom)
FrequenciesMP.dat contains the normal-mode frequencies and displacements of the molecule in its initial geometry and electronic state (usually the ground state). This information is used in the generation of initial conditions. If InitialCond$\neq$'NoSample' then either this file, Hessian.dat or Frequencies.dat (Sections Hessian.dat and Frequencies.dat respectively) must be present. The format of FrequenciesMP.dat follows the Molpro output of a Frequencies calculation (note: in the first line, the number of normal modes has to be given; the rest is as in the Molpro output):
6
1 A 2 A 3 A 4 A 5 A
Wavenumbers [cm-1] 1116.71 1725.49 1728.47 3435.76 3566.01
Intensities [km/mol] 157.34 17.93 16.24 1.67 0.53
Intensities [relative] 100.00 11.40 10.32 1.06 0.33
GX1 -0.10597 -0.00088 -0.00021 -0.03801 -0.00009
GY1 0.00067 -0.05838 -0.02628 -0.00017 -0.07554
GZ1 0.00004 0.02639 -0.05807 0.00078 0.00226
GX2 0.49134 -0.14946 0.19728 0.17300 -0.07729
GY2 0.03972 0.54519 0.46553 -0.12339 0.02439
GZ2 -0.19161 0.21763 -0.00782 0.51879 -0.19043
GX3 0.49290 -0.09010 -0.22955 0.17771 -0.20720
GY3 0.13665 0.43154 -0.28739 -0.39612 0.35792
GZ3 0.13722 -0.52910 0.11024 -0.37702 0.36169
GX4 0.48838 0.25184 0.03520 0.17755 0.28570
GY4 -0.18573 -0.16545 0.18702 0.52182 0.66736
GZ4 0.05376 -0.05521 0.70450 -0.15258 -0.20268
6 A
Wavenumbers [cm-1] 3570.66
Intensities [km/mol] 0.61
Intensities [relative] 0.39
GX1 -0.00060
GY1 -0.00245
GZ1 -0.07574
GX2 0.28798
GY2 -0.16745
GZ2 0.68133
GX3 -0.20790
GY3 0.37733
GZ3 0.33817
GX4 -0.07175
GY4 -0.17584
GZ4 0.03308
Note: Only the real, non-zero frequencies should be included in this file (i.e. those corresponding to vibrations). The first line of the file must be the number of frequencies. See section harmonic vibrational frequencies (FREQUENCIES) for details on how to perform a normal-mode frequencies calculation in Molpro.
As an alternative to FrequenciesMP.dat, AIMS can generate the normal mode frequencies after reading in the Hessian from Hessian.dat. The format of this file is:
natom
Hess(1,1) Hess(2,1) \ldots Hess(3*natom,3*natom)
Note: the Hessian should not be mass weighted. It is permissible to have carriage returns in the list of Hessian components.
As an alternative to FrequenciesMP.dat and Hessian.dat, AIMS can read in normal-mode frequencies and vectors in AIMS format in Frequencies.dat. The format of this file is:
natom nmodes
freq(1) freq(2) \ldots freq(nmodes)
modevec(1,1) modevec(2,1) \ldots modevec(3*natom,nmodes)
Note: Frequencies must be in cm$^{-1}$, but normal mode vectors can be mass scaled or not- AIMS will detect. Also, it is permissible to have carriage returns in the list of frequencies and mode vectors. This file is generated by AIMS if either FrequenciesMP.dat or Hessian.dat is used initially.
If Constraint=.true. then Constraints.dat must be supplied. This is a fortran NAMELIST file that defines the geometric constraints in the system. These constraints are enforced with the RATTLE algorithm. The parameters contained in this file are:
| Constraint parameters | ||
|---|---|---|
| Parameter | Options (Default) | Description |
NumBonds | Integer (0) | Number of bond lengths to constrain. Define IBondPtcles below. |
IBondPtcles(2,NumBonds) | Integer (0) | List of atom indices that are bonded. See NumBonds above. |
NumAngles | Integer (0) | Number of bond angles to constrain. Define IAnglePtcles below. |
IAnglePtcles(3,NumAngles) | Integer (0) | List of atom indices that define bond angles. |
NComAtoms | Integer (0) | Number of atoms that define the center-of-mass constraint. Define ICOMPtcles below. |
ICOMPtcles(NComAtoms) | Integer (0) | List of atom indices that define the center of mass. |
Toler | Real (1E-4) | Rattle tolerance |
MaxIts | Integer (10000) | Maximum number of Rattle iterations |
Note, a maximum of 1000 constraints is allowed.
This section gives an overview of how to set up and run a CASSCF ab initio multiple spawning calculation.
1) The first step is to create a molpro input deck that controls how the CASSCF electronic structure calculations are performed. AIMS requires a fairly complicated structure to the molpro deck and it is highly recommended that you use the ethylene CASSCF example as a starting point (section examples). Control.dat should then be modified for your system and desired simulation parameters (section Control.dat).
2) Next, the initial conditions should be defined. This involves providing an initial geometry in Geometry.dat (section Geometry.dat) and normal-mode frequencies and displacements in FrequenciesMP.dat (section FrequenciesMP.dat), which will be used to generate a phase-space distribution that the initial conditions sample. Alternatively, one can also provide momenta in Geometry.dat and set InitialCond='NoSample' in Control.dat, and directly specify the initial conditions.
3) The AIMS calculation is then initiated by running molpro on the input deck, in the usual fashion. In order to sample different initial conditions, multiple AIMS simulations should be run with different values of the random number seed IRndSeed (or different Geometry.dat files) - each of these should be run in a unique directory.
Beyond the regular molpro output, which contains the electronic structure output, AIMS writes to a number of text files, depending on the output parameters in Control.dat (section Control.dat). All values are given in atomic units unless otherwise specified. Electronic properties of a trajectory are evaluated at the center geometry of the trajectory basis function.
MPCALC procedure.EXPEC,QMRR.The following two examples show how AIMS can be run in either single-state first-principle molecular dynamics mode, or multi-state spawning mode. The parameters found in these input files were chosen for illustrative purposes and are not necessarily appropriate for your system of interest. It is recommended the literature be consulted before performing AIMS simulations.
Ethylene Hartree-Fock First-Principles Molecular Dynamics
See examples/aims_ethyl_HF
! FMS-Molpro does not support parallel execution.
if(NPROC_MPP.gt.1) then
skipped
endif
if(.not.modul_aims) then
skipped
endif
SYMMETRY,nosym
ORIENT,noorient
GEOMTYP=xyz
GEOMETRY={
6
ethylene ground-state geom
C 0.0000000031 0.0000000000 0.6768496105
C -0.0000000013 0.0000000000 -0.6768496105
H -0.0000000017 0.9131426983 -1.2402810929
H -0.0000000095 0.9131426983 1.2402810929
H -0.0000000159 -0.9131426983 1.2402810929
H 0.0000000047 -0.9131426983 -1.2402810929
}
BASIS=6-31g**
MPINIT={
hf
}
MPCALC={
! Calculate Energy and Forces
show,itimestep,itrj;
hf
ener( 1 )=energy( 1 )
if(status.lt.0) then
text,ERROR: could not converge SCF.
STOP
endif
pop;density
force
}
aims,dir='./aims_ethyl_HF'
&control !------ Initialization -------! InitState=1 iRndSeed=1 !------ Simulation Properties -------! IMethod=0 !Single- state dynamics - no couplings. NumParticles=6 !Number of atoms NumStates=1 !number of electronic states !-------- Integration and numerics --------! TimeStep=20.0 !timestep for integration SimulationTime=2000.0 !integration time MinTimeStep=1.0 !minimum adaptive timestep !------- Ouput options ---------! zAllText=.false. zEDatFile=.true. !Energy file zNDatFile=.false. !Population file zTrajFile=.true. !Trajectory data file zAmpFile=.false. !Amplitude files zPotEnFile=.true. !Potential energy files zXYZ=.true. !XYZ files zCoupFile=.false. !Coupling files zChargeFile=.false. !Charge files zDipoleFile=.false. !Dipole files zTDipoleFile=.false. !Transition dipole files / !using default atom types, so user-defined types are not necessary
UNITS=BOHR
6
C 0.000000 0.000000 1.279060
C 0.000000 0.000000 -1.279060
H 0.000000 1.725590 -2.343792
H 0.000000 1.725590 2.343792
H 0.000000 -1.725590 2.343792
H 0.000000 -1.725590 -2.343792
#Momenta
0.000 0.000 0.000
0.000 0.000 0.000
0.000 0.000 0.000
0.000 0.000 0.000
0.000 0.000 0.000
0.000 0.000 0.000
Ethylene CASSCF Spawning Dynamics
See examples/aims_ethyl_CASSCF
!Ethylene (2/2)-CASSCF AIMS deck.
!This can be used as a template for other simulations by changing
!User options below. The deck calculates couplings for up to three
!states simultaneously coupled to the occupied state (NUMCOUP=3.0),
!which should suffice for most applications. If this needs to be increased,
!modify MPCALC accordingly.
!User options
symmetry,nosym !Do not change!
occ,9,context=MCSCF
closed,7,context=MCSCF
wf,16,1,0
nstate=3
orient,noorient !Do not change!
geomtyp=xyz !Do not change!
geometry={
6
ethylene ground-state geom
C 0.0000000031 0.0000000000 0.6768496105
C -0.0000000013 0.0000000000 -0.6768496105
H -0.0000000017 0.9131426983 -1.2402810929
H -0.0000000095 0.9131426983 1.2402810929
H -0.0000000159 -0.9131426983 1.2402810929
H 0.0000000047 -0.9131426983 -1.2402810929
}
basis=6-31g*
!Aims variables - do not change!
! FMS-Molpro does not support parallel execution.
if(NPROC_MPP.gt.1) then
skipped
endif
if(.not.modul_aims) then
skipped
endif
! tighten thresholds:
gthresh,twoint=1.0d-13
gthresh,energy=1.0d-7,gradient=1.0d-2
! records used by AIMS
orbrec=2101.2
cirec=2501.2
diabrec=3000.2
gradrec0=5101.1
do icoup=1,nstate-1
gradrec(icoup)=gradrec0+icoup
enddo
MPINIT={ !Find the initial CASSCF wavefunction
if(orbital.eq.0) then
hf
multi
pspace,10.0
wf;state,nstate
maxiter,20
orbital,orbrec
ciguess,cirec
save,det=cirec
if (status.lt.0) then
text, MCSCF failed in MPINIT.
text, Attempting uncoupled iterations.
{multi,so
pspace,10.0
wf;state,nstate
orbital,orbrec
ciguess,cirec
save,det=cirec
maxiter,50}
endif
if(status.lt.0) then
text,ERROR: could not converge MCSCF.
text,FMS should now stop
STOP
endif
endif
}
MPCALC={ !Calculate Energy and Forces
if (jtrj.eq.0) then
show,itimestep,itrj;
else
show,itimestep,itrj,jtraj
endif
data,truncate,diabrec
data,truncate,gradrec0
do icoup=1,nstate-1
data,truncate,gradrec(icoup)
enddo
data,copy, orbrec, diabrec
{multi
pspace,10.0
wf;state,nstate
maxiter,20
orbital,orbrec
ciguess,cirec
dm,orbrec
save,det=cirec
diab,diabrec,save=orbrec
}
if (status.lt.0) then
text, MCSCF failed in MPCALC.
text, Attempting uncoupled iterations.
{multi
pspace,10.0
state,nstate
orbital,orbrec
ciguess,cirec
dm,orbrec
save,det=cirec
{iterations
do,uncouple,1,to,10}
maxiter,30
diab,diabrec,save=orbrec
}
endif
if(status.lt.0) then
text,ERROR: could not converge MCSCF.
text,FMS should now stop
STOP
endif
do istate=1,nstate
ener( istate )=energy( istate )
enddo
pop;density,orbrec,state=stateind
if (numcoup.eq.0.0) then
{multi
pspace,10.0
wf;state,nstate
maxiter,20
orbital,orbrec
ciguess,cirec
save,det=cirec
diab,diabrec,save=orbrec
cpmcscf,grad,stateind,save=gradrec0;
}
elseif (numcoup.eq.1.0) then
{multi
pspace,10.0
wf;state,nstate
maxiter,20
orbital,orbrec
ciguess,cirec
save,det=cirec
diab,diabrec,save=orbrec
cpmcscf,grad,stateind,save=gradrec0;
cpmcscf,nacm,stateind,stateind2(1),save=gradrec(1);
}
elseif (numcoup.eq.2.0) then
{multi
pspace,10.0
wf;state,nstate
maxiter,20
orbital,orbrec
ciguess,cirec
save,det=cirec
diab,diabrec,save=orbrec
cpmcscf,grad,stateind,save=gradrec0;
cpmcscf,nacm,stateind,stateind2(1),save=gradrec(1);
cpmcscf,nacm,stateind,stateind2(2),save=gradrec(2);
}
elseif (numcoup.eq.3.0) then
{multi
pspace,10.0
wf;state,nstate
maxiter,20
orbital,orbrec
ciguess,cirec
save,det=cirec
diab,diabrec,save=orbrec
cpmcscf,grad,stateind,save=gradrec0;
cpmcscf,nacm,stateind,stateind2(1),save=gradrec(1);
cpmcscf,nacm,stateind,stateind2(2),save=gradrec(2);
cpmcscf,nacm,stateind,stateind2(3),save=gradrec(3);
}
elseif (numcoup.ge.4.0) then
text, Number of couplings requested: $numcoup beyond limits of input deck.
text, Please modify input deck accordingly.
STOP
endif
forces;samc,gradrec0
}
MGCOUP={
forces;nacm,gradrec(ncoup)
}
! writes a molden file
WRITEMOLDEN={
moldenfile='$itrj.$itimestep.molf'
put,molden,$moldenfile;
}
AIMS,dir='./aims_ethyl_CASSCF'
&control
!------ Initialization -------!
NumStates=3 !Number of electronic states
InitState=2 !Initial trajectory's state
NumParticles=6 !Number of atoms
IMethod=1 !CASSCF dynamics with couplings
IRestart=0 !Do not restart
IRndSeed=1 !Random number seed
InitialCond='WIGNER' !Sample from Wigner Distribution
!-------- Integration and numerics --------!
TimeStep=20.0 !Simulation timestep
SimulationTime=800.0 !Simulation length - note this is short for illustrative purposes
ExShift=77.8381 !Diagonal shift of Hamiltonian
CoupTimeStep=5.0 !Timestep in coupling regions
MinTimeStep=1.0 !Minimum adaptive timestep
!-------- Spawning -------!
CSThresh=3.0 !Coupling threshold to enter spawning mode
PopToSpawn=0.01 !Minimum population before spawning
OMax=0.6 !Prevent spawning if spawned trajectory has at least
!this much overlap with existing basis
MaxTraj=50 !Max number of trajectories
IgnoreState=1 !Remove uncoupled trajectories on S0
MaxEDiff=0.04 !Energy gap threshold for calculating couplings
!------ Output Options -----!
zEDatFile=.true. !Energy file
zNDatFile=.true. !Population file
zTrajFile=.false. !Trajectory data file
zAmpFile=.true. !Amplitude files
zPotEnFile=.true. !Potential energy files
zXYZ=.true. !XYZ files
zCoupFile=.true. !Coupling files
zChargeFile=.true. !Charge files
zDipoleFile=.true. !Dipole files
zTDipoleFile=.true. !Transition dipole files
WriteMolden=.true. !Write molden files?
MoldenStep=100 !time between molden files
/
UNITS=BOHR
6
C .0000000059 .0000000000 1.2790603970
C -.0000000025 .0000000000 -1.2790603970
H -.0000000032 1.7255896200 -2.3437915934
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