The OH-yield in the reaction of O(1D) + CH4 under high pressure conditions up to 560 bar helium

被引：11

作者：

Ausfelder, Florian ^{[1
]}

Hippler, Horst ^{[2
]}

Striebel, Frank ^{[2
]}

机构：

[1] Department of Chemistry, Joseph Black Building, Edinburgh, West Mains Road

[2] Lehrstuhl für Molekulare Physikalische Chemie, Universität Karlsruhe, D-76128 Karlsruhe

来源：

Zeitschrift fur Physikalische Chemie | 2000年 / 214卷 / 04期

关键词：

Collisional deactivation - Electronic ground state - Fluorescence lifetimes - High pressure - High-pressure condition - Laser induced fluorescence - Pulsed laser photolysis - Vibrationally excited;

D O I：

10.1524/zpch.2000.214.4.403

中图分类号：

学科分类号：

摘要：

The pressure dependence of the OH yield in the reaction O(1D) + CH4 has been investigated at room temperature in the pressure range from 4 to 560 bar of helium. O(1D)-atoms were generated by pulsed laser photolysis (PLP) of N2O and OH-radicals were detected by saturated laser induced fluorescence (SLIF). The OH-yield was determined relative to the OH yield in the reaction of O(1D) with H2 which is assumed to be unity and pressure independent. Within the pressure range of our experiments we found a constant OH-yield of (71 ± 5)% in the reaction of O(1D) with methane. From the OH fluorescence lifetime at the highest pressures near 500 bar of helium we obtained the rate constant for the collisional deactivation of electronically OH radicals of kq(He) = (3 ±0.3) × 10-15 cm3 s-1, corresponding to a cross section of σq(He) = (2.1 ± 0.2)× 10-20 cm2. The rate constant for collisional deactivation of vibrationally excited OH radicals in the electronic ground state OH(v = 1) + He → OH(v = 0) + He (reaction (5)) was determined to be k5(He) = (1.2 ± 0.2)× 10-16cm3 s-1. © 2000, Oldenbourg Wissenschaftsverlag, München. All rights reserved.

引用

页码：403 / 417

共 47 条

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