Measurements of Line Strengths and Calculations of their Temperature Dependence of n2 IR Transitions of the Methyl Radical

Details Measurements of Line Strengths and Calculations of their Temperature Dependence of n2 IR Transitions of the Methyl Radical Measurements of Line Strengths and Calculations of their Temperature Dependence of n2 IR Transitions of the Methyl Radical

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..gecpt2013r&link_type=abstract

American Physical Society, 57th Gaseous Electronics Conference, 26-29 September, 2004, Shannon, Republic of Ireland, MEETING ID:

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The determination of methyl radical concentrations in terrestrial and astronomical sources using infrared spectroscopy relies on the availability of accurate line strengths and transition dipole moments. The ν 2 fundamental of CH3 near 606 cm-1 is particularly useful for this purpose but up to the moment only one transition line strength, Q(8,8), was presented [1]. This value is measured at room temperature with an uncertainty of at least 32 %. We have measured the line strength of 9 Q-branch lines of the 2_0^1 band of CH3 from Q(1,1) to Q(12,12) using diode laser absorption spectroscopy. Calculations of the temperature dependence of the line strengths were done. The choice of line to optimise the sensitivity for detecting the methyl radical by infrared absorption spectroscopy is an important consideration in practical applications. Therefore, line strength of the strongest lines and their temperature variation will be given for different temperature range: for the astronomical use, cryogenic temperatures, for typical kinetic flow tube and laboratory plasma, 300 -- 1000 K, and for diamond deposition plasma, above 2000 K. [1] J. Wormhoudt, K.E. McCurdy, Chem. Phys. Letters, 156 1 (1989) 47

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