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.

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

Three- and two-photon absorption spectroscopy: REMPI of HCl and HBr

2001 ◽  
Vol 79 (2-3) ◽  
pp. 197-210 ◽  
Author(s):  
Á. Kvaran ◽  
H Wang ◽  
B G Waage
Keyword(s):  
Absorption Line ◽  
Line Strength ◽  
Multiphoton Ionization ◽  
Photon Absorption ◽  
Excitation Process ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Population Distributions ◽  
Photon Excitation ◽  
First Time

Approximation expressions for absorption line strengths due to Ω' = 0,1,2,3 ¬ Ω" = 0 (Σ, Π, Δ, and Φ ¬ Σ) transitions for three-, two-, and one-photon absorptions are summarized. Those for three- and two-photon absorptions are used to analyse room temperature (3+1) and (2+1) REMPI (resonance enhanced multiphoton ionization) spectra due to transitions to Rydberg states in HCl and HBr to give spectroscopic parameters. A mechanism of the three-photon excitation process for the (E1 Σ+) ¬ X(1Σ+), (0,0) transition in HCl is proposed. A Rydberg state, not observed in single- or two-photon absorption, with a band origin at 80 167 cm-1 was identified in (3+1) REMPI of HBr and analysed for the first time. It was assigned to the l(3(Φ(Ω' = 3)) ((σ2π3)5dδ) state, (0,0) band. Use of the three-photon absorption line strength expressions for deriving rotational population distributions in ground-state HBr is demonstrated. PACS Nos.: 03.40Kf, 42.65Tg, 42.81Dp

Investigation of the nonlinear absorption spectrum of all-trans retinoic acid by using the steady and transient two-photon absorption spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (91) ◽  
pp. 74531-74538 ◽  
Author(s):  
M. G. Vivas ◽  
J. P. Siqueira ◽  
D. L. Silva ◽  
L. de Boni ◽  
C. R. Mendonca
Keyword(s):  
Absorption Spectrum ◽  
Retinoic Acid ◽  
Excited State ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Trans Retinoic Acid ◽  
All Trans Retinoic Acid ◽  
Complete Study ◽  
First Time

This paper reports for the first time a complete study on the steady and transient excited state dynamics induced by 2PA for ATRA.

Gas Phase Two-Photon Spectroscopy of Polyazines: Pyrazine

1979 ◽  
Vol 34 (8) ◽  
pp. 979-982 ◽  
Author(s):  
I. Knoth ◽  
H. J. Neusser ◽  
E. W. Schlag
Keyword(s):  
Excited State ◽  
Gas Phase ◽  
Vibrational Frequencies ◽  
Photon Absorption ◽  
Excitation Spectra ◽  
Selection Rules ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Excitation ◽  
Two Photon Excitation

Abstract The two-photon excitation spectra of gas phase pyrazine-h4 and -d 4 in the region of the S1←S0 transition are presented. The two-photon absorption which is electronically forbidden is induced by-various vibrations of ungerade parity. Because of the different selection rules for two-photon transitions hitherto unknown vibrational frequencies in the excited state 1B3u have been determined.

Femtosecond Spectroscopic Studies of the One- and Two-Photon Excited-State Dynamics of 2,2,17,17-Tetramethyloctadeca-5,9,13-trien-3,7,11,15-tetrayne:  A Trimeric Oligodiacetylene

2006 ◽  
Vol 110 (40) ◽  
pp. 11435-11439 ◽  
Author(s):  
Grzegorz M. Balkowski ◽  
Michiel Groeneveld ◽  
Hong Zhang ◽  
Cindy C. J. Hendrikx ◽  
Michael Polhuis ◽  
...  
Keyword(s):  
Excited State ◽  
Spectroscopic Studies ◽  
Excited State Dynamics ◽  
Two Photon ◽  
The One

scholarly journals Exploring the Franck-Condon region of a photoexcited charge transfer complex in solution to interpret femtosecond stimulated Raman spectroscopy: excited state electronic structure methods to unveil non-radiative pathways

2021 ◽  
Author(s):  
Federico Coppola ◽  
Paola Cimino ◽  
Umberto Raucci ◽  
Maria Gabriella Chiariello ◽  
Alessio Petrone ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Electronic Structure ◽  
Excited State ◽  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Main Role ◽  
Photoinduced Charge Transfer ◽  
Electronic Structure Methods ◽  
Franck Condon ◽  
Photoinduced Charge

We present electronic structure methods to unveil non-radiative pathways of photoinduced charge transfer (CT) reactions that play a main role in photophysics and light harvesting technologies. A prototypical π-stacked molecular...

scholarly journals Probing intramolecular vibronic coupling through vibronic-state imaging

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Fan-Fang Kong ◽  
Xiao-Jun Tian ◽  
Yang Zhang ◽  
Yun-Jie Yu ◽  
Shi-Hao Jing ◽  
...  
Keyword(s):  
Single Molecule ◽  
Molecular Spectroscopy ◽  
Transition Density ◽  
Real Space ◽  
Vibronic Coupling ◽  
Vibronic State ◽  
Dipole Orientation ◽  
Transition Dipole ◽  
Franck Condon ◽  
Strong Dynamic

AbstractVibronic coupling is a central issue in molecular spectroscopy. Here we investigate vibronic coupling within a single pentacene molecule in real space by imaging the spatial distribution of single-molecule electroluminescence via highly localized excitation of tunneling electrons in a controlled plasmonic junction. The observed two-spot orientation for certain vibronic-state imaging is found to be evidently different from the purely electronic 0–0 transition, rotated by 90°, which reflects the change in the transition dipole orientation from along the molecular short axis to the long axis. Such a change reveals the occurrence of strong vibronic coupling associated with a large Herzberg–Teller contribution, going beyond the conventional Franck–Condon picture. The emergence of large vibration-induced transition charges oscillating along the long axis is found to originate from the strong dynamic perturbation of the anti-symmetric vibration on those carbon atoms with large transition density populations during electronic transitions.

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