Ly(α) absorption cross-section of H2O and O2 |
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Authors: | Dieter Kley |
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Institution: | (1) Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 80303 Boulder, CO, U.S.A. |
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Abstract: | The absorption cross-sections of water vapor and oxygen were measured, using a low-pressure radio frequency discharge through traces of hydrogen in argon as a light source for Ly() radiation. The cross-sections are H2O = 1.59 × 10–17 cm2 and O2 = 1.13 × 10–20 + 1.72 × 10–23 for water and oxygen, respectively, where P is the oxygen pressure in units of Torr. Ly() lamps, such as used for this work, are important light sources for photochemical laboratory work and find applications for trace-gas detection in the atmosphere. For the latter application, accurate cross-sections of water vapor and oxygen are needed. |
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Keywords: | Absorption cross-section Ly()" target="_blank">gif" alt="agr" align="BASELINE" BORDER="0">) H2O O2 trace gas detection |
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