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PHILLIP S. THOMAS, NATHAN P. BOWLING AND ROBERT J. MCMAHON, Department of Chemistry, University of Wisconsin, Madison, WI 53706.
Triplet HC5H,a along with several derivatives (RC5R'; R, R' = H-, CH3-, (CH3)3C-), have been observed and characterized by IR, UV-vis, and ESR spectroscopy in cryogenic matrices. The structural similarity of RC5R molecules to known interstellar molecules allows their consideration as plausible interstellar species. The electronic spectrum of HC5H clarifies some ambiguities concerning earlier attempts to detect this species and provides a foundation for further gas-phase spectroscopic studies. The optical spectra of HC5H and analogs also exhibit rich vibronic fine structure, and will be discussed in the context of the diffuse interstellar bands (DIBs). In addition, the photoisomerizations of RC5R molecules will be briefly discussed.
aN. P. Bowling, R. J. Halter, J. A. Hodges, R. A. Seburg, P. S. Thomas, C. S. Simmons, J. F. Stanton, and R. J. McMahon. J. Am. Chem. Soc. (2006) ASAP.