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  • PACS: 82.50Fv; 82.80Ch  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    NO and PO photofragments as trace analyte indicators of nitrocompounds and organophosphonates (2000)
    Springer
    Applied physics 71 (2000), S. 665-672 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 82.50Fv; 82.80Ch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Laser photolysis that releases characteristic photofragments, combined with laser-induced fluorescence (LIF) that subsequently monitors them, facilitate detection of trace-vapor analytes in air. The feasibility of the technique is demonstrated for nitrocompounds and organophosphonates detection. Using one-color and two-color lasers, respectively, the representative NO and PO photofragments were tagged. Employment of longer wavelengths for photodissociation, and where possible also for LIF, than for fluorescence collection, obstructs background fluorescence and in the former compounds also prevents interference of ambient ground state NO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000382
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  • 2
    Electronic Resource
    Electronic Resource
    The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators (2000)
    Springer
    Applied physics 70 (2000), S. 621-625 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 82.50Fv; 82.80Ch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A one-color laser performs photolysis of nitrocompounds and laser-induced fluorescence to monitor the generated NO photofragments and to sensitively detect vapor trace amounts of nitrocompounds. The NO is monitored via excitation and emission through A2Σ+(v′=0)?X2Π(v′′=2-0) and A2Σ+(v′=0)?X2Π(v′′=0,1) transitions, respectively. It is found that NO photofragments populate the vibrationless ground state and also the first two vibrationally excited states. The analytical performance of the method is demonstrated on 2,4 dinitrotoluene (DNT) via excitation through A2Σ+(v′=0)?X2Π(v′′=2). The achieved limits of detection are 3.7 and 2.7 parts per billion (ppb) by weight of gaseous DNT in 100 and 500 Torr of air, for 30 s integration time. The application of this scheme for trace nitrocompound detection has the advantage that no background of ambient ground-state NO interferes and that the fluorescence is collected at shorter wavelengths than the exciting radiation, precluding background fluorescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050870
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