Energy dependence of electronic relaxation processes in polyatomic molecules

2007 ◽  
pp. 23-168 ◽  
Author(s):  
K. F. Freed
Keyword(s):  
Energy Dependence ◽  
Polyatomic Molecules ◽  
Relaxation Processes ◽  
Electronic Relaxation

Femtosecond UV Studies of the Electronic Relaxation Processes in Cytochromec

2011 ◽  
Vol 115 (46) ◽  
pp. 13723-13730 ◽  
Author(s):  
Olivier Bräm ◽  
Cristina Consani ◽  
Andrea Cannizzo ◽  
Majed Chergui
Keyword(s):  
Relaxation Processes ◽  
Electronic Relaxation

A very rapid electronic relaxation process in a highly conjugated Zn(ii)porphyrin–[26]hexaphyrin–Zn(ii)porphyrin hybrid tape

2016 ◽  
Vol 18 (4) ◽  
pp. 3244-3249 ◽  
Author(s):  
Sangsu Lee ◽  
Hirotaka Mori ◽  
Taegon Lee ◽  
Manho Lim ◽  
Atsuhiro Osuka ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Vibrational Relaxation ◽  
Energy Relaxation ◽  
Relaxation Processes ◽  
Electronic Relaxation ◽  
Vibronic State ◽  
Molecular Systems

We demonstrate that the electronic deactivation overtakes the vibrational relaxation processes in the energy relaxation processes from the initially excited vibronic state manifolds in highly conjugated molecular systems.

scholarly journals Experimental and Theoretical Analysis of Non-linear Vibrational Relaxation of Polyatomic Molecules Strongly Excited by Resonant Laser Radiation

1988 ◽  
Vol 8 (2-4) ◽  
pp. 315-334
Author(s):  
L. Carlomusto ◽  
A. Cartelli ◽  
S. Solimeno ◽  
R. Velotta ◽  
R. Bruzzese
Keyword(s):  
Vibrational Relaxation ◽  
Polyatomic Molecules ◽  
Relaxation Processes ◽  
Molecular Dissociation ◽  
Molecular Gases ◽  
Simple Theoretical Model ◽  
Rough Approximation ◽  
Resonant Laser ◽  
Non Linear ◽  
Made In

We present a very simple theoretical model aimed at the analysis of non-linear relaxation processes in molecular gases in the presence of partial molecular dissociation induced by vibrational–vibrational exchange between highly excited molecules. The model has a phenomenological character, since it analyzes the behavior of a system of anharmonic diatomic molecules, which is a very rough approximation of a polyatomic molecule such as SF6. Nonetheless, it provides an interesting key for the interpretation of a number of peculiar features characterizing our experimental observation, with which a comparison is made. In particular, the model takes realistic account of the influence of dissociation processes on the relaxation time.

Energy transfer in polyatomic molecules. II. Relative catalytic efficiency for energy transfer to different vibrations to the same molecule

1961 ◽  
Vol 264 (1318) ◽  
pp. 299-308 ◽  
Keyword(s):  
Energy Transfer ◽  
Sulphur Dioxide ◽  
Deuterium Oxide ◽  
Relaxation Times ◽  
Catalytic Efficiency ◽  
Polyatomic Molecules ◽  
Fair Agreement ◽  
Water Molecules ◽  
Relaxation Processes ◽  
Ultrasonic Measurements

Vibrations of sulphur dioxide show two separate relaxation times. Values of r 1 = 6.0 × 10 -8 s for the vibrations of 519 cm -1 and r 2 = 1.2 × 10 -6 s for the vibrations of 1151 and 1361 cm -1 have been derived from new ultrasonic measurements, in fair agreement with earlier work. Molecules studied as possible vibration-translation catalysts included ethane, ethylene, water, and n -hexane. No enhanced efficiency of energy transfer was observed with ethylene. Ethane and water molecules were found to be only moderately efficient catalysts; proportionally, they exert a greater effect for processes associated with r 1 . Deuterium oxide is found to be somewhat more efficient than water. n -Hexane is highly efficient for both the r 1 and r 2 relaxation processes of sulphur dioxide. These observations are discussed in relation to various mechanisms for the catalysis of energy transfer.

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