Abstract
We report the first accurate measurements of the transition strengths and linewidths of the 00o2 9.4 μm sequence lines of CO2. This sequence band is found to be very similar to the regular 00o1 laser band, except for an experimentally determined factor of 1.89±0.12 increase in transition strength (if the CO2 molecule is treated as a simple harmonic oscillator the theoretical increase in transition strength is 2.0). The laser absorption spectrometer used for these measurements can detect absorption coefficients in CO2 of ≈10−7 m−1, and we discuss the feasibility of using this sensitivity to monitor rare isotopic forms of CO2.
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Work supported by the Department of National Health and Welfare, Environment Canada, Ontario Ministry of the Environment, and Atmospheric Environment Service, Environment Canada.
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Reid, J., Shewchun, J. & Garside, B.K. Measurement of the transition strength of the 00o2 9.4 μm sequence band in CO2 using a tunable diode laser. Appl. Phys. 17, 349–353 (1978). https://doi.org/10.1007/BF00886204
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DOI: https://doi.org/10.1007/BF00886204