Rate constants for the relaxation of CH(X(2)pi,nu=1) by CO and N-2 at temperatures from 23 to 584 K

被引：47

作者：

Herbert, LB ^{[1
]}

Sims, IR ^{[1
]}

Smith, IWM ^{[1
]}

Stewart, DWA ^{[1
]}

Symonds, A ^{[1
]}

Canosa, A ^{[1
]}

Rowe, BR ^{[1
]}

机构：

[1] UNIV RENNES 1, DEPT PHYS ATOM & MOL, UA 1203 CNRS, F-35042 RENNES, FRANCE

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1996年 / 100卷 / 36期

关键词：

D O I：

10.1021/jp960808z

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：

Rate constants have been determined for the collisional relaxation of CH(X(2) Pi,nu = 1) by CO and N-2 over a wide range of temperatures. Experiments between 584 and 86 K have been performed in heated and cryogenically cooled cells, and rate constants from 295 to 23 K have been measured in a CRESU (cinetique de reaction en ecoulement supersonique uniforme) apparatus. In both series of experiments, pulsed laser photolysis was employed to generate CH radicals and the laser-induced fluorescence technique was used to observe the rate of removal of CH(nu = 1). Vibrational relaxation is rapid, k(298) = 9.7 x 10(-11) cm(3) molecule(-1) s(-1) for CO and k(298) = 3.1 x 10(-11) cm(3) molecule(-1) s(-1) for N-2, and the dependence of the rate constants on temperature is quite slight but complex. The results suggest that relaxation occurs via strongly bound complexes, and the implications of the results for the interpretation of the reactions between CH radicals and CO and N-2 are discussed.

引用

页码：14928 / 14935

页数：8

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