Computation, Theory and Dynamics Research Theme Seminar
Guest Speaker: Dr Julia Lehman, University of Leeds
Title: Frequency Comb Laser High Resolution Infrared Spectroscopy of Alkyl Halides
Abstract: Frequency comb spectroscopy is a useful tool for measuring high resolution infrared spectra. An overview of this methodology will be given, followed by its application to the infrared spectra of alkyl halides. A 250 MHz repetition rate frequency comb laser was utilized to measure the high resolution vibrational spectrum of diiodomethane, CH2I2, from 2950 to 3130 cm-1. Within this region, we recorded the rovibrational structure of two fundamental transitions, ν6 and ν1, where the resolution was found to be limited by pressure broadening across both vibrational bands. Over 300 transitions were assigned and rotational constants have been fitted to the experimental spectrum. In addition to the two fundamental transitions, combination bands are present with the low lying ν4 I-C-I bend. Finally, we offer a comparison of the CH2I2 spectrum to the equivalent regions for CH2F2, CH2Cl2, and CH2Br2.
Academic host: Dr Bryan Bzdek