title: Gas-phase electronic transitions of C₁₇H₁₂N⁺ at 15 K.
abstract: The electronic spectrum of C17H12N(+), phenanthrene with a side chain, was measured in the gas phase at a vibrational and rotational temperature of ∼15 K in an ion trap using a resonant multiphoton dissociation technique. The C17H12N(+) structure was produced in a chemical ionization source and identified by a comparison with theoretical calculations of stable structures and excitation energies. The (3), (2), (1) (1)A ← X (1)A electronic transitions of this nitrogen-containing aromatic species with 30 atoms have origin band maxima at 23,586 ± 1 cm(-1), 16,120 ± 50 cm(-1), and 14,519 ± 30 cm(-1). Distinct vibrational structure in the (3) (1)A state is observed, and assignments are made. Astronomical aspects are considered.
authors.affiliation: Department of Chemistry, University of Basel , Klingelbergstrasse 80, CH-4056 Basel, Switzerland.
authors.forename: F-X
authors.initials: FX
authors.lastname: Hardy
authors.forename: C A
authors.initials: CA
authors.lastname: Rice
authors.forename: O
authors.initials: O
authors.lastname: Gause
authors.forename: J P
authors.initials: JP
authors.lastname: Maier