Excited singlet state time-resolved Raman spectra of 4,4′-bipyridine and quantum chemical analysis of resonance Raman intensities

2000 ◽  
Vol 31 (4) ◽  
pp. 275-281 ◽  
Author(s):  
V. De Waele ◽  
G. Buntinx ◽  
O. Poizat ◽  
J.-P. Flament
Keyword(s):  
Chemical Analysis ◽  
Raman Spectra ◽  
Quantum Chemical ◽  
Singlet State ◽  
Resonance Raman ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Quantum Chemical Analysis ◽  
Time Resolved ◽  
State Time

Role of Excited Singlet State in the Photooxidation of Carotenoids:  A Time-Resolved Q-Band EPR Study

1996 ◽  
Vol 100 (2) ◽  
pp. 669-671 ◽  
Author(s):  
A. S. Jeevarajan ◽  
L. D. Kispert ◽  
N. I. Avdievich ◽  
M. D. E. Forbes
Keyword(s):  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved

scholarly journals Two Distinct Solvated Structures of Para-Nitroaniline in Acetonitrile and Their Dissociation and Reassociation Dynamics

1999 ◽  
Vol 19 (1-4) ◽  
pp. 329-333 ◽  
Author(s):  
K. Mohanalingam ◽  
S. Yamaguchi ◽  
H. Hamaguchi
Keyword(s):  
Singular Value Decomposition ◽  
Absorption Spectra ◽  
Time Constant ◽  
Singlet State ◽  
Temporal Evolution ◽  
Singular Value ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved ◽  
Value Decomposition

We have measured the femtosecond time-resolved absorption spectra of para-nitroaniline in acetonitrile just after the photoexcitation to the lowest excited singlet state. The Singular Value Decomposition (SVD) analysis shows that two temporal evolutions follow the photoexcitation. The fast component (0.7 ps time constant) describes the dissociation of the 1:2 associated form to generate the 1:0 form followed by its reassociation with AN molecules. A slower temporal evolution of 10 ps is most likely to represent the cooling down process of the whole system.

scholarly journals Picosecond Raman Investigation of the Structure and Reactivity of 4,4′-Bipyridine in the S1 State

1999 ◽  
Vol 19 (1-4) ◽  
pp. 353-356
Author(s):  
G. Buntinx ◽  
L. Bussotti ◽  
V. De Waele ◽  
C. Didierjean ◽  
O. Poizat
Keyword(s):  
Raman Spectroscopy ◽  
Time Domain ◽  
Electronic Excitation ◽  
Singlet State ◽  
Resonance Raman Spectroscopy ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved ◽  
Pump Probe ◽  
Spectroscopic Evidence

The lowest excited singlet state (S1) of 4,4′-bipyridine (44BPY) has been studied in water and methanol by using pump-probe time-resolved resonance Raman spectroscopy in the picosecond time domain. Spectroscopic evidence for a disymmetric S1 structure with localization of the electronic excitation in one of the two pyridyl rings is given. The fast formation of the N-hydro radical 44BPYH• from the S1 state is clearly observed in methanol.

ChemInform Abstract: Role of Excited Singlet State in the Photooxidation of Carotenoids: A Time-Resolved Q-Band EPR Study

ChemInform ◽  
2010 ◽  
Vol 27 (20) ◽  
pp. no-no
Author(s):  
A. S. JEEVARAJAN ◽  
L. D. KISPERT ◽  
N. I. AVDIEVICH ◽  
M. D. E. FORBES
Keyword(s):  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved

scholarly journals Bond formation dynamics of dicyanoaurate in the first excited singlet state

2019 ◽  
Vol 205 ◽  
pp. 09021
Author(s):  
So Hyeong Sohn ◽  
Taiha Joo
Keyword(s):  
Wave Packet ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Bond Formation ◽  
Excited Singlet State ◽  
Time Resolved Fluorescence ◽  
Excited Singlet ◽  
Time Resolved ◽  
Formation Dynamics ◽  
Coherent Vibration

Time-resolved fluorescence of [Au(CN)2−]3 in water reveals a coherent vibration of 74 cm-1. A massive non-Condon effect, proved unambiguously by time-resolved fluorescence spectra, demonstrates that the wave packet motion arises from the coherent bond formation.

Experimentelle und Quantenchemische Untersuchungen der Dipolmomente von Substituierten Stilbenen im Ersten Angercgten Singulettzustand / Experimental and Quantum Chemical Investigations of Dipole Moments of Substituted Stilbens in the First Excited Singlet State

1977 ◽  
Vol 32 (5) ◽  
pp. 420-425 ◽  
Author(s):  
A. Kawski ◽  
I. Gryczyński
Keyword(s):  
Dipole Moment ◽  
Excited States ◽  
Ground State ◽  
Quantum Chemical ◽  
Singlet State ◽  
Dipole Moments ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Fluorescent State ◽  
Experimental Values

Abstract The values a/a3 (α = polarizability), the Onsager cavity radii a and the dipole moments μe of six substituted stilbens in the fluorescent state have been determined. It is shown that if the dipole moment of the lowest excited singlet state μe is parallel to the dipole moment in the ground state μg, the values of μe and a can be determined from the solvent effects. Moreover, quantum chemical investigations of the dipole moments in the ground and excited states were carried out with the Pariser-Parr-Pople method and compared with the experimental values.

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