Geometry change of simple aromatics upon electronic excitation obtained from Franck-Condon fits of dispersed fluorescence spectra

2004 ◽  
Vol 121 (6) ◽  
pp. 2598 ◽  
Author(s):  
Petra Imhof ◽  
Daniel Krügler ◽  
Robert Brause ◽  
Karl Kleinermanns
Keyword(s):  
Fluorescence Spectra ◽  
Electronic Excitation ◽  
Dispersed Fluorescence ◽  
Franck Condon

Excitation and dispersed fluorescence spectra of the 1B2(V)-1Σg+(X̄) transition of jet-cooled CS2

1984 ◽  
Vol 86 (1-2) ◽  
pp. 173-188 ◽  
Author(s):  
Hiroshi Kasahara ◽  
Naohiko Mikami ◽  
Mitsuo Ito ◽  
Suehiro Iwata ◽  
Isao Suzuki
Keyword(s):  
Fluorescence Spectra ◽  
Dispersed Fluorescence

The Acetylene S0Surface: From Dispersed Fluorescence Spectra to Polyads to Dynamics

1995 ◽  
Vol 99 (3) ◽  
pp. 555-560 ◽  
Author(s):  
Stephani Ann B. Solina ◽  
Jonathan P. O'Brien ◽  
Robert W. Field ◽  
William F. Polik
Keyword(s):  
Fluorescence Spectra ◽  
Dispersed Fluorescence

scholarly journals Electronic Spectra of 1-Phenylethylamine and its Derivatives in Supersonic Jets

1990 ◽  
Vol 10 (3) ◽  
pp. 169-175
Author(s):  
Seiji Yamamoto ◽  
Taeko Niwa ◽  
Mitsuo Ito
Keyword(s):  
Relaxation Process ◽  
Electronic Spectra ◽  
Fluorescence Spectra ◽  
Phenyl Group ◽  
Nonradiative Relaxation ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra ◽  
Dispersed Fluorescence ◽  
Asymmetric Carbon

The S1←S0 fluorescence excitation spectra and dispersed fluorescence spectra of jet-cooled (+)-, (-)- and (±)-1-phenylethylamine and their derivatives (amides) have been observed. The 0-0 band of the amine locates at 37,641 cm-1. The amides which were synthesized from (+)-amine or (-)-amine with (+)-tartaric acid are diastereomers. It was found that the two diastereomers give the identical spectra with the 0-0 band at 34,757 cm-1. No difference in the spectrum indicates that the excitation is localized in the phenyl group which is far from the asymmetric carbon causing diastereoism. It was also found that 1-phenylethylamine has a fast nonradiative relaxation process in the Sstate, but such a process is removed by the formation of the amide.

scholarly journals Internal Rotation of the Methyl Group in the Electronically Excited State: o- and m-Toluidine

1987 ◽  
Vol 7 (2-4) ◽  
pp. 197-212 ◽  
Author(s):  
Katsuhiko Okuyama ◽  
Naohiko Mikami ◽  
Mitsuo Ito
Keyword(s):  
Excited State ◽  
Internal Rotation ◽  
Barrier Height ◽  
Ground State ◽  
Electronic Excitation ◽  
Vibrational Analysis ◽  
Fluorescence Excitation ◽  
Close Relationship ◽  
Electronically Excited ◽  
Dispersed Fluorescence

The fluorescence excitation and dispersed fluorescence spectra of jet-cooled o- and m-toluidine were observed. Vibrational analysis of the spectra provided us with the potentials for the internal rotation of the CH3 group in both ground and excited states. In o-toluidine, a large potential barrier to the internal rotation in the ground state is practically removed in the excited state. On the other hand, a nearly free internal rotation of the CH3 group in the ground state of m-toluidine gains a large barrier by the electronic excitation. The great change in the barrier height upon the electronic excitation is more remarkable than that found for fluorotoluene. A close relationship between the barrier height and the π electron density at the ring carbon atom was found, indicating the hyperconjugation as the origin of the barrier height in the absence of steric hindrance.

Unexpected simplicity in the S1–S0 dispersed fluorescence spectra of 13C2H2

2002 ◽  
Vol 116 (18) ◽  
pp. 7939-7947
Author(s):  
Michelle L. Silva ◽  
Matthew P. Jacobson ◽  
Zicheng Duan ◽  
Robert W. Field
Keyword(s):  
Fluorescence Spectra ◽  
Dispersed Fluorescence
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