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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 4 — Feb. 1, 2005
  • pp: 611–619

Quantitative Absorption Spectroscopy of Residual Water Vapor in High-Purity Gases: Pressure Broadening of the 1.39253-µm H2O Transition by N2, HCl, HBr, Cl2, and O2

Vasil Vorsa, Seksan Dheandhanoo, Suhas N. Ketkar, and Joseph T. Hodges  »View Author Affiliations


Applied Optics, Vol. 44, Issue 4, pp. 611-619 (2005)
http://dx.doi.org/10.1364/AO.44.000611


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Abstract

We determined the respective pressure-broadening coefficients of HCl, HBr, Cl2, and O2 (expressed relative to that of the reference gas N2) for the (nu1,nu2,nu3)J_Ka,Kc = (0,0,0)3_0,3 --> (1,0,1)2_0,2 rovibrational transition of H2 ^16O that occurs at 1.39253 µm. The experiment used a continuous-wave cavity ring-down spectroscopy analyzer to measure the peak absorption losses as a function of added moisture concentration. The measured pressure-broadening coefficients for HCl, HBr, Cl2, and O2 are, respectively, 2.76, 2.48, 1.39, and 0.49 times that of the N2 pressure-broadening coefficient, and detection limits for water vapor range from 0.22 nmol mol^-1 for O2 matrix gas to 2.3 nmol mol^-1 for HBr matrix gas. The degradation of the detection limit (relative to the N2 matrix gas) is ascribed to a pressure-broadening-induced reduction in peak absorption cross section and to elevated background loss from the matrix gas.

© 2005 Optical Society of America

OCIS Codes
(300.0300) Spectroscopy : Spectroscopy
(300.1030) Spectroscopy : Absorption

Citation
Vasil Vorsa, Seksan Dheandhanoo, Suhas N. Ketkar, and Joseph T. Hodges, "Quantitative Absorption Spectroscopy of Residual Water Vapor in High-Purity Gases: Pressure Broadening of the 1.39253-µm H2O Transition by N2, HCl, HBr, Cl2, and O2," Appl. Opt. 44, 611-619 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-4-611

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