High-resolution absorption coefficient and refractive index spectra of carbon monoxide gas at millimeter and submillimeter wavelength region

Mohammed N. Afsar; Hua Chi; Hassan Sobhie

doi:10.1117/12.182978

19 August 1994 High-resolution absorption coefficient and refractive index spectra of carbon monoxide gas at millimeter and submillimeter wavelength region

Mohammed N. Afsar, Hua Chi, Hassan Sobhie

Author Affiliations +

Proceedings Volume 2211, Millimeter and Submillimeter Waves; (1994) https://doi.org/10.1117/12.182978
Event: Millimeter and Submillimeter Waves and Applications: International Conference, 1994, San Diego, CA, United States

Abstract

The absorption coefficient and refractive index spectra of carbon monoxide gas are presented together for the first time in the range 300-900 GHz. An extra high resolution dispersive Fourier transform spectrometer was constructed for studies of gas molecules particularly pollutants. Line positioned can now be studied much precisely via dispersion data since the dispersion through a sharp rotational absorption line is a straight line rather than an envelope. It is therefore not necessary to interpolate around the turning point to determine the line position accurately. A demonstration of the much better resolved splitting for the J" equals 4 rotational transition line (at wavenumber equals 19.222 cm^-1) is shown. The line position we obtained agrees well with theoretical calculations. Results presented in this paper were obtained at a gas pressure of 250 torr.

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Mohammed N. Afsar, Hua Chi, and Hassan Sobhie "High-resolution absorption coefficient and refractive index spectra of carbon monoxide gas at millimeter and submillimeter wavelength region", Proc. SPIE 2211, Millimeter and Submillimeter Waves, (19 August 1994); https://doi.org/10.1117/12.182978

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