title: Electronic gas-phase spectra of larger polyacetylene cations.
abstract: The origin bands of the A 2Pi-X 2Pi electronic transition for three new linear polyacetylene cation chains, HC12H+, HC14H+, and HC16H+, have been recorded in the gas phase at approximately 30 K, located at 924.7, 1034.6, and 1144.0 nm. The absorption spectra were observed using a two-color two-photon ion-photodissociation experiment that utilizes the cooling capabilities of a 22-pole ion trap. Such spectra allow a direct comparison between laboratory and astrophysical data; however, no matches were found between the experimentally determined origin bands and the known diffuse interstellar bands.
authors.affiliation: Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland.
authors.forename: Anatoly
authors.initials: A
authors.lastname: Dzhonson
authors.forename: Evan B
authors.initials: EB
authors.lastname: Jochnowitz
authors.forename: John P
authors.initials: JP
authors.lastname: Maier