Issue 18, 2017

Revisiting the (E + A) ⊗ (e + a) problems of polyatomic systems with trigonal symmetry: general expansions of their vibronic Hamiltonians

Abstract

In this work, we derive general expansions in vibrational coordinates for the (E + A) ⊗ (e + a) vibronic Hamiltonians of molecules with one and only one C3 axis. We first derive the expansion for the lowest C3 symmetry. Additional symmetry elements systematically eliminate terms in the expansion. We compare our expansions with the previous results for two cases, the Image ID:c7cp01171g-t73.gif and the C3 (E + A) ⊗ e. The first comparison demonstrates the robustness, completeness, conciseness, and convenience of our formalism. There is a systematic discrepancy in the second comparison. We discuss the origin of the discrepancy and use a numerical example to corroborate our expansion. Our formalism covers 153 vibronic problems in 6 point groups. It also gives general expansions for the spin–orbit vibronic Hamiltonians of the p-type (E + A) ⊗ (e + a) problems.

Graphical abstract: Revisiting the (E + A) ⊗ (e + a) problems of polyatomic systems with trigonal symmetry: general expansions of their vibronic Hamiltonians

Supplementary files

Article information

Article type
Paper
Submitted
21 Feb 2017
Accepted
17 Mar 2017
First published
29 Mar 2017

Phys. Chem. Chem. Phys., 2017,19, 11098-11110

Revisiting the (E + A) ⊗ (e + a) problems of polyatomic systems with trigonal symmetry: general expansions of their vibronic Hamiltonians

T. Zeng and I. Seidu, Phys. Chem. Chem. Phys., 2017, 19, 11098 DOI: 10.1039/C7CP01171G

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