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.

scholarly journals Picosecond Time-Resolved Fourier Transform Raman Spectroscopy of 9,10-Diphenylanthracene in the Excited Singlet State

1995 ◽  
Vol 49 (5) ◽  
pp. 645-649 ◽  
Author(s):  
Gouri S. Jas ◽  
Chaozhi Wan ◽  
Carey K. Johnson
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Excited State ◽  
Near Infrared ◽  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved ◽  
Fourier Transform Raman Spectroscopy ◽  
Fourier Transform Raman

Time-resolved Fourier transform Raman spectroscopy of the highly fluorescent chromophore 9,10-diphenylanthracene (DPA) in cyclohexane and ethanol is described. Raman spectra of the first excited singlet state of DPA were obtained with 100-ps resolution at several time delays between pump pulses at 355 nm and probe pulses at 1064 nm. The near-infrared excited-state Raman scattering is enhanced by resonance with an excited-state transition of DPA. The excited-state Raman bands decay in about 5–6 ns. Evidence for interaction of the solvent with the DPA excited state is observed in the cyclohexane C-H stretching bands.

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.

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.

Time-resolved resonance Raman spectroscopy of excited singlet and triplet states of free-base meso-tetraphenylporphyrin

1993 ◽  
Vol 97 (45) ◽  
pp. 11599-11602 ◽  
Author(s):  
Steven E. J. Bell ◽  
Ala H. R. Al-Obaidi ◽  
Martin Hegarty ◽  
Ronald E. Hester ◽  
John J. McGarvey
Keyword(s):  
Raman Spectroscopy ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Triplet States ◽  
Free Base ◽  
Excited Singlet ◽  
Time Resolved ◽  
Singlet And Triplet States

Picosecond time-resolved absorption measurements on the excited singlet state of biphenylene

1990 ◽  
Vol 169 (5) ◽  
pp. 421-426 ◽  
Author(s):  
Anunay Samanta ◽  
Chelladurai Devadoss ◽  
Richard W. Fessenden
Keyword(s):  
Singlet State ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Time Resolved ◽  
Absorption Measurements
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