title: Optical-optical double resonance spectroscopy of the C(2)Pi-A(2)Pi and D(2)Sigma(+)-A(2)Pi transitions of SrF.
abstract: Optical-optical double resonance spectroscopy has been used to record rotationally resolved spectra of the C(2)Pi-A(2)Pi and D(2)Sigma(+)-A(2)Pi transitions of SrF. In the investigation, the spectrum of a previously unobserved (2)Sigma(+)-A(2)Pi transition was recorded. The new (2)Sigma(+) state was found to lie lower in energy than the previously labeled D(2)Sigma(+) (v = 0) state by an amount equal to the vibrational spacing of the D(2)Sigma(+) state. Therefore, the new (2)Sigma(+) state was assigned as the v = 0 level of the D(2)Sigma(+) state and the previous labeling of the vibrational quantum numbers of the D(2)Sigma(+) state should be increased by 1. Spectroscopic parameters were determined for the C(2)Pi, D(2)Sigma(+) (v = 0), and D(2)Sigma(+) (v = 1) states. The D(2)Sigma(+) (v = 0) state was found to be perturbed, most likely by the spin-orbit components of the C(2)Pi (v =1) state. The spin-orbit constant of the C(2)Pi state was found to decrease significantly relative to the A(2)Pi state, similar to CaF and SrOH. Finally, the C(2)Pi and D(2)Sigma(+) states do not appear to form a unique perturber/pure precession pair of states.
authors.affiliation: Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Phillip M
authors.initials: PM
authors.lastname: Sheridan
authors.forename: Jin-Guo
authors.initials: JG
authors.lastname: Wang
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Dick
authors.forename: Peter F
authors.initials: PF
authors.lastname: Bernath