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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 40, Iss. 8 — Nov. 1, 1986
  • pp: 1108–1110

Intracavity Helium-Neon Laser Photothermal Deflection as a Sensitive Technique for Trace Gas Analysis

Chieu D. Tran

Applied Spectroscopy, Vol. 40, Issue 8, pp. 1108-1110 (1986)


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Abstract

A novel, compact, ultrasensitive, and inexpensive He-Ne laser intracavity photothermal deflection spectrometer has been developed. In this apparatus a gas sample is placed inside a cavity of the He-Ne laser, which serves as a probe laser. A CO2 excitation laser coaxially overlaps with the He-Ne laser beam inside the sample cell. The detection limit for ethanol vapor in air at 1 atm excited with 1.5 W of CO2 laser chopped at 13.3 Hz is estimated to be 2.5 ppb.

Citation
Chieu D. Tran, "Intracavity Helium-Neon Laser Photothermal Deflection as a Sensitive Technique for Trace Gas Analysis," Appl. Spectrosc. 40, 1108-1110 (1986)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-40-8-1108

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