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Laboratory Electronic Spectra of Carbon Chains and Rings

Published online by Cambridge University Press:  21 February 2014

L. N. Zack
Affiliation:
Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056, Basel, Switzerland email: j.p.maier@unibas.ch
J. P. Maier
Affiliation:
Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056, Basel, Switzerland email: j.p.maier@unibas.ch
Corresponding
E-mail address:
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Abstract

Carriers of the diffuse interstellar bands (DIBs) cannot be definitively identified without laboratory spectra. Several techniques, including matrix isolation, cavity ringdown spectroscopy, resonance enhanced multiphoton ionization, and ion trapping, have been used to measure the electronic spectra of carbon chains and their derivatives. The gas-phase laboratory spectra could then be compared to the astronomical data of known DIBs. The choice of molecules studied in the gas phase depends on the presence of strong electronic transitions at optical wavelengths, the lifetimes of excited electronic states, and chemical feasibility in diffuse astrophysical environments. Collisional-radiative rate models have also be used in conjunction with laboratory spectra to predict absorption profiles under interstellar conditions.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

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