First comparison of vibrational relaxation in ground and excited electronic states of polyatomic molecules. S0 and S1 p-difluorobenzene

1983 ◽  
Vol 87 (24) ◽  
pp. 4952-4956 ◽  
Author(s):  
Desmond J. Muller ◽  
Warren D. Lawrance ◽  
Alan E. W. Knight
Keyword(s):  
Vibrational Relaxation ◽  
Electronic States ◽  
Polyatomic Molecules ◽  
Excited Electronic States

Electronic and Vibrational Relaxation in Sulfur Dioxide Vapor

1974 ◽  
Vol 52 (13) ◽  
pp. 2389-2398 ◽  
Author(s):  
Robert B. Caton ◽  
A. R. Gangadharan
Keyword(s):  
Quantum Yield ◽  
Sulfur Dioxide ◽  
Vibrational Relaxation ◽  
Pressure Range ◽  
Laser Excitation ◽  
Electronic States ◽  
Excited Electronic States ◽  
Wide Bandwidth ◽  
Phosphorescence Quantum Yield

Vibrational relaxation in the A1B1 and a3B1 excited electronic states of sulfur dioxide vapor has been observed by direct spectroscopic means. The effects of vibrational relaxation on the phosphorescence quantum yield have been investigated in the pressure range from 0.6 to 200 mTorr of pure sulfur dioxide and in mixtures of sulfur dioxide with He, N2, CO2, and SF6. Phosphorescence persists at the lowest pressure reached for excitation at 302.0 or 313.1 nm, contrary to previous reports. The mechanism for the production of sulfur dioxide phosphorescence for the wide bandwidth excitation used here (185–370 cm−1) is consistent with recent evidence for two fluorescing species provided by Brus and McDonald from laser-excitation experiments.

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