Jump to main content
Jump to site search

Issue 44, 2008
Previous Article Next Article

Rotationally resolved infrared spectroscopy of a jet-cooled phenyl radical in the gas phase

Author affiliations

Abstract

The first high-resolution IR spectra of a jet-cooled phenyl radical are reported, obtained via direct absorption laser spectroscopy in a slit-jet discharge supersonic expansion. The observed A-type band arises from fundamental excitation of the out-of-phase symmetric CH stretch mode (ν19) of b2 symmetry. Unambiguous spectral assignment of the rotational structure to the phenyl radical is facilitated by comparison with precision 2-line combination differences from Fourier transform microwave and direct absorption mm-wave measurements on the ground state [R. J. McMahon et al., Astrophys. J., 2003, 590, L61]. Least-squares fits to an asymmetric top Hamiltonian permit the upper-state rotational constants to be obtained. The corresponding gas-phase vibrational band origin at 3071.8904 (10) cm−1 is in remarkably good agreement with previous matrix isolation studies [A. V. Friderichsen et al., J. Am. Chem. Soc., 2001, 123, 1977], and indicates only a relatively minor red shift (≈0.9 cm−1) between the gas and Ar matrix phase environment. Such studies offer considerable promise for further high resolution IR study of other aromatic radical species of particular relevance to combustion phenomena and interstellar chemistry.

Graphical abstract: Rotationally resolved infrared spectroscopy of a jet-cooled phenyl radical in the gas phase

Back to tab navigation

Article information


Submitted
01 Aug 2008
Accepted
19 Aug 2008
First published
03 Oct 2008

Phys. Chem. Chem. Phys., 2008,10, 6592-6596
Article type
Communication

Rotationally resolved infrared spectroscopy of a jet-cooled phenyl radical in the gas phase

E. N. Sharp, M. A. Roberts and D. J. Nesbitt, Phys. Chem. Chem. Phys., 2008, 10, 6592
DOI: 10.1039/B813256A

Social activity

Search articles by author

Spotlight

Advertisements