Dissociative recombination of HCl+, H2Cl+, DCl+, and D2Cl+ in a flowing afterglow

被引：8

作者：

Wiens, Justin P. ^{[1
]}

Miller, Thomas M. ^{[1
]}

Shuman, Nicholas S. ^{[1
]}

Viggiano, Albert A. ^{[1
]}

机构：

[1] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2016年 / 145卷 / 24期

关键词：

HERSCHEL/HIFI DISCOVERY; POSITIVE-IONS; TEMPERATURE; COEFFICIENTS; ENERGY; CHLORONIUM; KINETICS; AR+;

D O I：

10.1063/1.4972063

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：

Dissociative recombination of electrons with HCl+, H2Cl+, DCl+, and D2Cl+ has been measured under thermal conditions at 300, 400, and 500 K using a flowing afterglow-Langmuir probe apparatus. Measurements for HCl+ and DCl+ employed the variable electron and neutral density attachment mass spectrometry (VENDAMS) method, while those for H2Cl+ and D2Cl+ employed both VENDAMS and the more traditional technique of monitoring electron density as a function of reaction time. At 300 K, HCl+ and H2Cl+ recombine with k(DR) = 7.7 +/-(4.5)(2.1) x 10(-8) cm(3) s(-1) and 2.6 +/- 0.8 x 10(-7) cm(3) s(-1), respectively, whereas D2Cl+ is roughly half as fast as H2Cl+ with k(DR) = 1.1 +/- 0.3 x 10(-7) cm(3) s(-1) (2 sigma confidence intervals). DCl+ recombines with a rate coefficient below the approximate detection limit of the method (<5 x 10(-8) cm(3) s(-1)) at all temperatures. Relatively slow dissociative recombination rates have been speculated to be responsible for the large HCl+ and H2Cl+ abundances in interstellar clouds compared to current astrochemical models, but our results imply that the discrepancy must originate elsewhere.

引用

页数：6