THE COLLISIONAL QUENCHING OF I(52P1/2) BY THE MOLECULES H2O, CH3OH, C2H5OH, HCOOH AND CH3COOH BY TIME-RESOLVED EMISSION (I(52P1/2)-]I(52P3/2)+HV,LAMBDA=1.315-MU-M) FOLLOWING PULSED-LASER PHOTOLYSIS

被引：0
|
作者：
LIZ, IIG
CASTANO, F
MARTINEZ, E
RAYO, MNS
机构：
[1] UNIV BASQUE COUNTRY, DEPT QUIM FIS, APARTADO 644, E-48040 BILBAO, SPAIN
[2] UNIV CASTILLA LA MANCHA, FAC CIENCIAS, DEPT QUIM FIS, CIUDAD REAL, SPAIN
来源：
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1991年 / 55卷 / 03期
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D O I：
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中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The collisional quenching of electronically excited iodine atoms, I(5p5(2P1/2)), by the molecules H2O, CH3OH, C2H5OH, HCOOH and CH3COOH was investigated directly in the time domain. I(2P1/2) was generated by the pulsed excimer laser photolysis of C3F7I at lambda = 248 nm and monitored by time-resolved emission at lambda = 1.315-mu-m (I(2P1/2 --> I(2P3/2) + h-nu). Absolute second-order quenching rate constants (k(Q)), including those for the collisional removal of the excited atom by the dimers (HCOOH)2 and (CH3COOH)2, were obtained for room temperature. The following results were obtained: [GRAPHICS] These results indicate that the main route for removal is the electronic energy transfer in the iodine atom to the second vibrational level in the O-H stretching mode in each case, via long-range attractive forces, probably involving dipole-quadrupole interaction on collision.
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页码：275 / 282
页数：8
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