Diode laser spectroscopy of methyl iodide at 850 nm
Abstract
Using the Tunable Diode Laser Absorption Spectroscopy (TDLAS) 82 CH3I ro-vibrational overtone absorption were detected for the first time between 11660 and 11840 cm-1 (844 -- 857 nm), with strengths estimated to be around 10-27 -- 10-26 cm/molecule. The lines have been measured utilizing commercial heterostructure F-P type diode lasers, multipass cells and the wavelength modulation spectroscopy with second harmonic detection technique. A high modulation amplitude approach was adopted for the analysis of the line shapes. Self-broadening coefficients have been obtained for two lines.
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