The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators

J. Shu; I. Bar; S. Rosenwaks

doi:10.1007/s003400050870

The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators

J. Shu, I. Bar, S. Rosenwaks

Department of Physics

Research output: Contribution to journal › Article › peer-review

47 Scopus citations

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 A ²Σ⁺(v′ = 0) ← X ²Π(v″ = 2 - 0) and A ²Σ⁺ (v′ = 0) → X ²Π(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 A ²Σ⁺(v′ = 0) ← X ²Π(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.

Original language	English
Pages (from-to)	621-625
Number of pages	5
Journal	Applied Physics B: Lasers and Optics
Volume	70
Issue number	4
DOIs	https://doi.org/10.1007/s003400050870
State	Published - 1 Jan 2000

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)
General Physics and Astronomy

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title = "The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators",

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 A 2Σ+(v′ = 0) ← X 2Π(v″ = 2 - 0) and A 2Σ+ (v′ = 0) → X 2Π(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 A 2Σ+(v′ = 0) ← X 2Π(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.",

author = "J. Shu and I. Bar and S. Rosenwaks",

year = "2000",

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doi = "10.1007/s003400050870",

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journal = "Applied Physics B: Lasers and Optics",

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T1 - The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators

AU - Shu, J.

AU - Bar, I.

AU - Rosenwaks, S.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - 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 A 2Σ+(v′ = 0) ← X 2Π(v″ = 2 - 0) and A 2Σ+ (v′ = 0) → X 2Π(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 A 2Σ+(v′ = 0) ← X 2Π(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.

AB - 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 A 2Σ+(v′ = 0) ← X 2Π(v″ = 2 - 0) and A 2Σ+ (v′ = 0) → X 2Π(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 A 2Σ+(v′ = 0) ← X 2Π(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.

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JF - Applied Physics B: Lasers and Optics

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ER -

The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators

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