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<p>Dear Molpro users,</p><p><br></p><p>I have tried to get MRCISD energy and spin orbit coupling (SOC) for 3F (term symbol)<span style="line-height: 17.6000003814697px; font-size: 11pt;"> Hf atom. (Electronic configuration of Hf atom is 6s2, 5d2)</span></p><p><br></p><p>MRCISD energy with the active space of 5d and 6s is obtained without an accurate degeneracy.</p><p>(7 states, (1Ag, 2B1g, 2B2g, 3B2g) should have the same energy.)</p><p><br></p><p>I have a similar problem for Y atom (5s2 4d1) case, and the problem can be solved according to the Peterson's advice to increase an active space.</p><p><br></p><p>The increased active space for Hf atom including 5s (which is semi core orbital) gives the improved result. The energy difference is reduced to 10^-6 scale but the energy level of 3F are not still perfectly degenerate.</p><p><br></p><p>Could you provide me to recover the degeneracy in MRCI calculation?</p><p><br></p><p>Any comments are welcome.</p><p><br></p><p>Best regards,</p><p><br></p><br><table width="99%" align="center"><tbody><tr valign="top"><td><p><span style="font-family: Arial;">---------------------------------------------------</span><br><span style="font-family: Arial;"><b>Hyungjun Kim</b>, Ph. D. Student,</span><br><span style="font-family: Arial;">Quantum Chemistry Laboratory, Department of Chemistry,</span></p><p><span style="font-family: Arial;">Korea Advanced Institute of Science and Technology [KAIST],</span><br><span style="font-family: Arial;">Daejeon 305-701, Korea</span><br><span style="font-family: Arial;">e-mail: </span><a href="mailto:hyungjun96@kaist.ac.kr"><span style="font-family: Arial;">hyungjun96@kaist.ac.kr</span></a><span style="font-family: Arial;"> or hyungjun96@gmail.com</span></p><span style="font-family: Arial;">
</span><p><span style="font-family: Arial;">phone : +82-42-350-2861</span></p><span style="font-family: Arial;">
</span><p><span style="font-family: Arial;">mobile phone : +82-10-8537-5051</span></p><span style="font-family: Arial;">
</span><p><span style="font-family: Arial;">web : http://qclab.kaist.ac.kr</span><br></p></td></tr></tbody></table><p><br></p>
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