scholarly journals Shape resonance and non‐Franck–Condon effects in (2+1) resonant enhanced multiphoton ionization of O2 via the C 3Πg state

1989 ◽  
Vol 90 (2) ◽  
pp. 633-640 ◽  
Author(s):  
M. Braunstein ◽  
J. A. Stephens ◽  
V. McKoy
Keyword(s):  
Multiphoton Ionization ◽  
Shape Resonance ◽  
Franck Condon

scholarly journals Attosecond timing of electron emission from a molecular shape resonance

2020 ◽  
Vol 6 (31) ◽  
pp. eaba7762 ◽  
Author(s):  
S. Nandi ◽  
E. Plésiat ◽  
S. Zhong ◽  
A. Palacios ◽  
D. Busto ◽  
...  
Keyword(s):  
Potential Barrier ◽  
Molecular Spectroscopy ◽  
Molecular Shape ◽  
High Spectral Resolution ◽  
Shape Resonance ◽  
Nuclear Motion ◽  
Centrifugal Barrier ◽  
Ionization Time ◽  
Molecular Photoionization ◽  
Franck Condon

Shape resonances in physics and chemistry arise from the spatial confinement of a particle by a potential barrier. In molecular photoionization, these barriers prevent the electron from escaping instantaneously, so that nuclei may move and modify the potential, thereby affecting the ionization process. By using an attosecond two-color interferometric approach in combination with high spectral resolution, we have captured the changes induced by the nuclear motion on the centrifugal barrier that sustains the well-known shape resonance in valence-ionized N2. We show that despite the nuclear motion altering the bond length by only 2%, which leads to tiny changes in the potential barrier, the corresponding change in the ionization time can be as large as 200 attoseconds. This result poses limits to the concept of instantaneous electronic transitions in molecules, which is at the basis of the Franck-Condon principle of molecular spectroscopy.

Shape-resonance-induced non-Franck-Condon vibrational intensities in 3 σgphotoionisation of N2

1980 ◽  
Vol 13 (3) ◽  
pp. L105-L108 ◽  
Author(s):  
J B West ◽  
A C Parr ◽  
B E Cole ◽  
D L Ederer ◽  
R Stockbauer ◽  
...  
Keyword(s):  
Shape Resonance ◽  
Franck Condon

Shape‐resonance‐induced non‐Franck–Condon effects in the valence‐shell photoionization of O2

1982 ◽  
Vol 76 (12) ◽  
pp. 5703-5709 ◽  
Author(s):  
P. M. Dittman ◽  
Dan Dill ◽  
J. L. Dehmer
Keyword(s):  
Shape Resonance ◽  
Valence Shell ◽  
Franck Condon

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.

scholarly journals Two-color resonance enhanced multiphoton ionization spectroscopy of o-hydroxybenzonitrile and Franck-Condon simulation

2022 ◽  
Vol 71 (2) ◽  
pp. 023301-023301
Author(s):  
Li Na ◽  
◽  
Li Shu-Xian ◽  
Wang Lin ◽  
Wang Hui-Hui ◽  
...  
Keyword(s):  
Multiphoton Ionization ◽  
Multiphoton Ionization Spectroscopy ◽  
Franck Condon
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