Affiliation:
1. School of Chemistry, University of Leeds, Leeds, United Kingdom
Abstract
Direct frequency comb spectroscopy was utilized to measure the vibrational absorption spectrum of diiodomethane, CH2I2, from 2960 to 3125 cm−1. The data were obtained using a CH2I2concentration of (6.8 ± 1.3) × 1015 molecule cm−3and a total pressure of 10–300 mbar with either nitrogen or argon as the bath gas. The rovibrational spectra of two fundamental transitions, ν6and ν1, were recorded and analyzed. We suggest that a significant contribution to the observed congested spectra is due to the population in excited vibrational states of the low energy ν4I–C–I bend, resulting in transitions 6104nnand 1104nn, where the integer n is the initial vibrational level v = 1–5. PGOPHER was used to fit the experimental spectrum, allowing for rotational constants and other spectral information to be reported. In addition, it was found that the peak widths for the observed transitions were limited by pressure broadening, resulting in a pressure broadening parameter of (0.143 ± 0.006) cm−1atm−1by N2and (0.116 ± 0.006) cm−1atm−1by Ar. Further implications for other dihaloalkane infrared spectra are discussed.
Funder
Engineering and Physical Sciences Research Council
Subject
Physical and Theoretical Chemistry,General Physics and Astronomy
Cited by
4 articles.
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