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The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators.

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Title: The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators.
Authors: Shu, J., Bar, I., Rosenwaks, S.
Source: Applied Physics B: Lasers & Optics. 2000, Vol. 70 Issue 4, p621. 5p.
Subjects: Lasers, Photochemistry, Fluorescence, Dinitrotoluenes
Abstract: 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 [sup 2]SIGMA [sup +] (v' = 0) X [sup 2]PI (v" = 2 - 0) and A [sup 2]SIGMA[sup +] (v' = 0) arrow right X [sup 2]PI(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 [sup 2]SIGMA[sup +] (v' = 0) X [sup 2]PI(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 Tort 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. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators.
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  Data: <searchLink fieldCode="AR" term="%22Shu%2C+J%2E%22">Shu, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Bar%2C+I%2E%22">Bar, I.</searchLink><br /><searchLink fieldCode="AR" term="%22Rosenwaks%2C+S%2E%22">Rosenwaks, S.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. 2000, Vol. 70 Issue 4, p621. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Lasers%22">Lasers</searchLink><br /><searchLink fieldCode="DE" term="%22Photochemistry%22">Photochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence%22">Fluorescence</searchLink><br /><searchLink fieldCode="DE" term="%22Dinitrotoluenes%22">Dinitrotoluenes</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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 [sup 2]SIGMA [sup +] (v' = 0) X [sup 2]PI (v" = 2 - 0) and A [sup 2]SIGMA[sup +] (v' = 0) arrow right X [sup 2]PI(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 [sup 2]SIGMA[sup +] (v' = 0) X [sup 2]PI(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 Tort 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Type: general
      – SubjectFull: Photochemistry
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      – SubjectFull: Fluorescence
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      – TitleFull: The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators.
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