Nitrobenzene detection by one-color laser-photolysis/laser-induced fluorescence of NO (ν" = 0-3)

被引:42
作者
Daugey, N
Shu, J
Bar, I [1 ]
Rosenwaks, S
机构
[1] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
[2] Ben Gurion Univ Negev, Inst Appl Res, IL-84105 Beer Sheva, Israel
关键词
one-color laser-photolysis laser-induced fluorescence; nitro compounds detection;
D O I
10.1366/0003702991945227
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Combined one-color laser-photolysis/laser-induced fluorescence methods have been applied to photodissociate nitrobenzene (NB) molecules and to detect the resulting nitric oxide (NO) photofragments, A one-color laser is used to induce photodissociation and detection of NO via the A(nu' = 0)-X(nu " = 0-4) transitions. A strongly wavelength-dependent signature is obtained due to the population of nu " = 0-3 of NO. The ratios of the peak heights of the P-12 band-head are (nu " = 0):(nu " = 1):(nu " = 2):(nu " = 3) = 1:0.3:0.1:0.02. A detection limit of similar to 500 ppb by weight of NB in air at pressures of 10 and 100 Torr is achieved by monitoring NO X(nu " = 2), This is the first attempt to use an excited NO vibrational level for NE detection, and the method can be extended to detection of other nitro compounds. It has the advantage that background of ambient ground-state NO is precluded.
引用
收藏
页码:57 / 64
页数:8
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