Open AccessA STUDY ON ROTATIONAL RELAXATION OF GAS PHASE C2H2 BY RAMAN UV OPTICAL DOUBLE RESONANCE
Author(s) -
Wenbin Gao,
R. Dopheide,
H. Zacharias
Publication year - 1992
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.41.400
Subject(s) - raman spectroscopy , excitation , atomic physics , ground state , resonance (particle physics) , materials science , analytical chemistry (journal) , relaxation (psychology) , laser , reaction rate constant , infrared , fluorescence , gas phase , nuclear magnetic resonance , physics , chemistry , optics , kinetics , psychology , social psychology , quantum mechanics , chromatography
In the present work, the selective preparation of C2H2 in discrete rotational states of the infrared inactive vibrational v mode in its electronic ground state (X1∑g+,v″2=1,J″= 9,11 and 13) is achieved by stimulated Raman excitation. From the UV laser induced fluorescence, A1Au(v′3=←X′∑g+ (v"2=1), the C2H2-C2H2 collisional R-R deactivation rate constants are measured. They are (7.96±1.04)×10-10cm3s-1 for J"= 9, (8.79±0.97)×l0-10cm3s-1 for J"= 11 and (8.76±0.88)×10-10cm3s-1 for J" = 13. The multiquanta R-R energy transfer rcte constants for trdnsitions from the initial pumped level to other different rotational states (v"2= 1, J" = 1,3,5,7,9,11,13,15) have been extracted directly.