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Line positions and intensities of the ?_4 band of methyl iodide using mid-infrared optical frequency comb Fourier transform spectroscopy

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Line positions and intensities of the ?_4 band of methyl iodide using mid-infrared optical frequency comb Fourier transform spectroscopy

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  • Author: I. Sadiek, A. Hjältén, F. S. Vieira, Ch. Lu, M. Stuhr, and A. Foltynowicz
We use optical frequency comb Fourier transform spectroscopy to measure high-resolution spectra of iodomethane, CH3I, in the Csingle bondH stretch region from 2800 to 3160 cm-1. The fast-scanning Fourier transform spectrometer with auto-balanced detection is based on a difference frequency generation comb with repetition rate, frep, of 125 MHz. A series of spectra with sample point spacing equal to frep are measured at different frep settings and interleaved to yield sampling point spacing of 11 MHz. Iodomethane is introduced into a 76 m long multipass absorption cell by its vapor pressure at room temperature.

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