DETECTION OF CHLORINATED HYDROCARBONS VIA LASER-ATOMIZATION LASER-INDUCED FLUORESCENCE

被引：21

作者：

JEFFRIES, JB ^{[1
]}

RAICHE, GA ^{[1
]}

JUSINSKI, LE ^{[1
]}

机构：

[1] HAMILTON COLL,DEPT CHEM,CLINTON,NY 13323

来源：

APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY | 1992年 / 55卷 / 01期

关键词：

D O I：

10.1007/BF00348618

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Chlorinated hydrocarbons (CHC), photodissociated at 193 nm, are detected with high sensitivity by observing the atomic chlorine fragment via laser-induced fluorescence (LIF). Photofragment emission spectra from CH3Cl, CH2Cl2, CHCl3, CCl4, C2HCl3, and C2Cl4 demonstrate that photofragment fluorescence and chemiluminescence are negligible in the region 700-800nm where the 3p(4)4p4S0 --> 3p(4)4s4P fluorescence from atomic chlorine is detected. There is also negligible interference for photodissociation in Ar, N2, and air bath gases. Total CHC can be readily detected in air flows at mixing fractions less than 20ppb and averaging times less than 1 minute. Techniques for considerable improvement in this detection limit are discussed.

引用

页码：76 / 83

页数：8

共 18 条

[1] CHLOROETHYLENE PHOTOCHEMICAL LASERS - VIBRATIONAL ENERGY CONTENT OF HCL MOLECULAR ELIMINATION PRODUCTS [J].