title: Electronic Ground and Excited State Spectroscopy of C(6)H and C(6)D.
abstract: Rotational transitions in the X(2)Pi ground state of C(6)H and C(6)D have been measured by Fourier transform microwave and millimeter-wave absorption spectroscopy. More than 150 rotational lines in the ground (2)Pi(3/2) and (2)Pi(1/2) ladders have been observed, allowing an accurate determination of the rotational, fine structure, lambda-doubling, and hyperfine coupling constants using a standard effective Hamiltonian for a molecule in an isolated (2)Pi electronic state. The molecular ground state constants are used to characterize the rotationally resolved origin band of the (2)Pi <-- X(2)Pi electronic transition observed by cavity ring-down laser absorption spectroscopy in a pulsed supersonic slit-jet discharge source. From these data, spectroscopic constants for the excited electronic state are determined. Copyright 1999 Academic Press.
authors.affiliation: Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 80, Basel, CH 4056, Switzerland
authors.initials: H
authors.lastname: Linnartz
authors.initials: T
authors.lastname: Motylewski
authors.initials: O
authors.lastname: Vaizert
authors.initials: JP
authors.lastname: Maier
authors.initials: AJ
authors.lastname: Apponi
authors.initials: MC
authors.lastname: McCarthy
authors.initials: CA
authors.lastname: Gottlieb
authors.initials: P
authors.lastname: Thaddeus