Computational and Quantum Chemistry – Telegram
Computational and Quantum Chemistry
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A group dedicated to everything about theoretical and computational/quantum chemistry.
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Do you struggle understanding the number of roots to use on a CAS calculation? (You are not alone).
This paper explains how this works and even give a table for each electronic configuration:

📄 OPEN ACCESS - Assessment of minimal active space CASSCF-SO methods for calculation of atomic Slater–Condon and spin–orbit coupling parameters in d- and f-block ions (Dalton Trans., 2021,50, 14130-14138)

🔗 https://pubs.rsc.org/en/content/articlelanding/2021/DT/D1DT02346B
mulliken1932.pdf
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The original paper by Mulliken that is the foundation of Molecular Orbital Theory: Phys Rev 40, 55–62 (1932)
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HOMO-LUMO gap is the energy that separates the last occupied and first unoccupied molecular orbitals. With that said, can an electronic transition occur in energies less than the HOMO-LUMO gap?
Anonymous Quiz
53%
Yes
47%
No
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