Infrared spectra of Rg1,2 - C6H6 complexes, Rg = He, Ne, Ar

TL;DR

This study investigates the infrared spectra of noble gas-benzene complexes, including new spectroscopic data for Ne2-C6H6 and He-Ne-C6H6, using advanced laser techniques to analyze their vibrational modes.

Contribution

First spectroscopic analysis of Ne2-C6H6 and He-Ne-C6H6 complexes, expanding understanding of noble gas interactions with benzene.

Findings

Infrared spectra of Rg1,2 - C6H6 complexes were observed and analyzed.

Four vibrational bands identified and linked to specific molecular motions.

Results align with previous ultraviolet and microwave studies.

Abstract

Infrared spectra of Rg1,2 - C6H6 complexes (Rg = He, Ne, Ar) are observed in the region of the nu12 fundamental of C6H6 using a pulsed supersonic jet expansion and a tunable optical parametric oscillator laser source. The mixed trimer He - Ne - C6H6 is also detected. Four bands are analyzed for each complex, namely nu12 itself (~3048 cm-1) and three linked combination bands (~3079, 3100, and 3102 cm-1). The results are consistent with previous ultraviolet and microwave results, with Ne2 - C6H6 and He - Ne - C6H6 being analyzed spectroscopically here for the first time.