Disturbance of laser-induced-fluorescence measurements of NO in methane-air flames containing chlorinated species by photochemical effects induced by 225-nm-laser excitation

被引：5

作者：

Desgroux, P ^{[1
]}

Devynck, P ^{[1
]}

Gasnot, L ^{[1
]}

Pauwels, JF ^{[1
]}

Sochet, LR ^{[1
]}

机构：

[1] Univ Sci & Technol Lille, Ctr Etud & Rech Lasers & Applicat, Lab Cinet & Chim Combust, CNRS,URA 876, F-59655 Villeneuve Dascq, France

来源：

APPLIED OPTICS | 1998年 / 37卷 / 21期

关键词：

D O I：

10.1364/AO.37.004951

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Laser-induced fluorescence measurements of NO in CH4 air flames seeded with CH3Cl and CH2Cl2 are described. The measurements are perturbed by strong photochemical effects characterized by UV emissions. The contribution of these background emissions is taken into account on the basis of an on-line-off-line resonance procedure. First results indicate an important increase of NO in the presence of chlorinated species. Background emissions observed in the range 220-260 nm and at 278 nm are ascribed, respectively, to electronically excited HCl and CCl photofragments. It is shown that C2H3Cl and CHCl2, species are responsible for the formation of HCl and CCl, respectively, and a photolytic mechanism for formation of the photofragments is proposed. (C) 1998 Optical Society of America.

引用

页码：4951 / 4962

页数：12

共 41 条

[1] Laser-induced fluorescence measurements of NO and OH mole fraction in fuel-lean high-pressure (1-10 atm) methane flames: Fluorescence modeling and experimental validation [J].