One‐ and two‐photon spectra of NaF:Cu+: Jahn–Teller and vibronic coupling effects

1983 ◽  
Vol 78 (6) ◽  
pp. 3688-3697 ◽  
Author(s):  
Stephen A. Payne ◽  
Andrea B. Goldberg ◽  
Donald S. McClure
Keyword(s):  
Vibronic Coupling ◽  
Coupling Effects ◽  
Two Photon ◽  
Jahn Teller ◽  
Photon Spectra

scholarly journals (2 + 2) Resonance Enhanced Multiphoton Ionization Spectra of Jet-Cooled ortho-, meta- and para-Xylene

1988 ◽  
Vol 9 (4-6) ◽  
pp. 241-263 ◽  
Author(s):  
T. G. Blease ◽  
R. J. Donovan ◽  
P. R. R. Langridge-Smith ◽  
T. Ridley
Keyword(s):  
Excited State ◽  
Multiphoton Ionization ◽  
Vibrational Frequencies ◽  
Vibronic Coupling ◽  
Two Photon ◽  
Para Xylene ◽  
Coupling Mode ◽  
Photon Spectra ◽  
First Time ◽  
Franck Condon

Two-photon spectra of the S1(Ã)–S0(X˜) transition of jet-cooled ortho-, meta- and para-xylene have been recorded in the region 43,000–37,000 cm−1 using resonance enhanced multiphoton ionization excitation. A full vibronic analysis for all three isomers has been carried out enabling the identification of several excited state vibrational frequencies for the first time. In particular, for ortho and para substitutions, a new, strong two-photon vibronic coupling mode ν19b has been identified, and the significance of this result is discussed. Some anomalies in the assignment of previously published spectra of the xylenes, and related disubstituted benzenes, have been observed and reassignments are suggested. In addition we show that the comparison of one and two-photon spectra provides a method for determining the mechanism by which totally symmetric fundamentals gain their intensity in one-photon spectra, namely either from Herzberg–Teller intensity stealing or due to favourable Franck–Condon overlap.

An alternative model of the vibronic coupling in octahedral complexes

1988 ◽  
Vol 53 (6) ◽  
pp. 1134-1140
Author(s):  
Martin Breza ◽  
Peter Pelikán
Keyword(s):  
Linear Regression ◽  
Alternative Model ◽  
Potential Surface ◽  
Analytical Formula ◽  
Coupling Model ◽  
Regression Method ◽  
Vibronic Coupling ◽  
Linear Regression Method ◽  
Active Systems ◽  
Jahn Teller

It is suggested that for some transition metal hexahalo complexes, the Eg-(a1g + eg) vibronic coupling model is better suited than the classical T2g-(a1g + eg) model. For the former, alternative model, the potential constants in the analytical formula are evaluated from the numerical map of the adiabatic potential surface by using the linear regression method. The numerical values for 29 hexahalo complexes of the 1st row transition metals are obtained by the CNDO/2 method. Some interesting trends of parameters of such Jahn-Teller-active systems are disclosed.

scholarly journals On the generation of electronic ring currents under vibronic coupling effects

2020 ◽  
Vol 153 (22) ◽  
pp. 224308
Author(s):  
Krishna Reddy Nandipati ◽  
Oriol Vendrell
Keyword(s):  
Vibronic Coupling ◽  
Coupling Effects ◽  
Ring Currents

Studies of the Jahn - Teller effect IV. The vibrational spectra of spin-degenerate molecules

1962 ◽  
Vol 255 (1050) ◽  
pp. 31-53 ◽  
Keyword(s):  
Raman Spectrum ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Physical Theory ◽  
Vibronic Coupling ◽  
Infra Red ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Active Vibration ◽  
Degenerate States

The physical theory necessary for interpreting the vibrational spectra of spin-degenerate molecules is developed in this paper. Particular attention is paid to those molecules whose behaviour is expected to be markedly different from that of both orbitally non-degenerate molecules and those with purely spatial degeneracy. These include certain Kramers degenerate molecules, whose Raman spectra are expected to contain reverse-polarized contributions, and also tetrahedral and octahedral molecules in fourfold degenerate states. The case of a fourfold degenerate octahedral molecule is investigated in the limits of strong vibronic coupling by one of the Jahn—Teller active vibrations (e g and t 2g ). It turns out that the forbidden t 2u vibration may be infra-red active, that the Raman spectrum may contain reverse-polarized contributions and that both infra-red and Raman spectra may contain strong progressions of bands involving multiple excitations of the vibronically active vibration.

Erratum: Two-photon spectra of single-crystal gadolinium diglycolate

1991 ◽  
Vol 44 (14) ◽  
pp. 7769-7769
Author(s):  
Tapanendu Kundu ◽  
Asok K. Banerjee ◽  
Mihir Chowdhury
Keyword(s):  
Single Crystal ◽  
Two Photon ◽  
Photon Spectra
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