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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 21 — Jul. 20, 1999
  • pp: 4705–4710

Dinitrobenzene Detection by Use of One-color Laser Photolysis and Laser-Induced Fluorescence of Vibrationally Excited NO

Jinian Shu, Ilana Bar, and Salman Rosenwaks  »View Author Affiliations


Applied Optics, Vol. 38, Issue 21, pp. 4705-4710 (1999)
http://dx.doi.org/10.1364/AO.38.004705


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Abstract

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 subsequent detection of NO photofragments by excitation and emission through <i>A</i>(<i>v</i>′ =) ← <i>X</i>(<i>v</i>″ = −) and <i>A</i>(<i>v</i>′ =) → <i>X</i>(<i>v</i>″ =,) 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 (<i>v</i>″ =):(<i>v</i>″ =):(<i>v</i>″ =) = :.:.. The limits of detection of DNB mixed with 100 or 500 Torr of air with <i>v</i>″ = excitation at 248 nm are 13 and 11 parts in 10<sup>9</sup> 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.

© 1999 Optical Society of America

OCIS Codes
(300.2530) Spectroscopy : Fluorescence, laser-induced
(350.3450) Other areas of optics : Laser-induced chemistry
(350.5130) Other areas of optics : Photochemistry

Citation
Jinian Shu, Ilana Bar, and Salman Rosenwaks, "Dinitrobenzene Detection by Use of One-color Laser Photolysis and Laser-Induced Fluorescence of Vibrationally Excited NO," Appl. Opt. 38, 4705-4710 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-21-4705

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