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首页> 外文期刊>Applied optics >Dinitrobenzene detection by use of one-color laser photolysis and laser-induced fluorescence of vibrationally excited NO
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Dinitrobenzene detection by use of one-color laser photolysis and laser-induced fluorescence of vibrationally excited NO

机译：二硝基苯的单色激光光解检测和激光诱导的振动激发NO荧光

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摘要

Trace concentrations of 1,4-dinitrobenzene (DNB) are detected by a combination of laser photolysis and laser-induced fluorescence. A one-color laser is applied to induce DNB photodissociation and for sub-sequent detection of NO photofragments by excitation and emission through A(v' = O) ← X(v" = 0 － 2) andA(v' ＝ 0)→X(v" ＝1) transitions, respectively. The resulting NO rovibrational excitation spectra serve as markers for the presence of DNB. The NO is produced in vibrational ground and excited states with peak height ratios of (v" = 0):(v" = 1):(v" = 2) = 1:0.5:0.13. The limits of detection of DNB mixed with 100 or 500 Torr of air with v" = 2 excitation at 248 nm are 13 and 11 parts in 10~(9) by weight, respectively, for a 30-s integration time. The application of this scheme for DNB detection has the advantage that no ambient ground state NO interferes and that the fluorescence is collected at shorter wavelengths than the exciting radiation, precluding background fluorescence.
机译：痕量的1,4-二硝基苯（DNB）通过激光光解和激光诱导的荧光检测得到。用一种单色激光诱导DNB光解离，并随后通过A（v'= O）←X（v“ = 0 － 2）和A（v'＝ 0）激发和发射来检测NO光碎片。 X（v“ ＝ 1）跃迁。所得的NO振动光谱作为DNB的标记。 NO在振动基态和激发态下产生，峰高比为（v“ = 0）:( v” = 1）:( v“ = 2）= 1：0.5：0.13。DNB的检出限与在30 nm的积分时间内，在248 nm处激发v“ = 2的100或500 Torr的空气分别占10〜（9）重量的13和11份。该方案在DNB检测中的应用具有以下优点：没有环境基态NO的干扰，并且荧光的激发波长比激发辐射短，但不包括背景荧光。

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