title: Resonance-Enhanced 2-Photon Ionization Scheme for C2 through a Newly Identified Band System: 4(3)Πg-a(3)Πu.
abstract: We report the observation of a new band system of C2, namely, the 4(3)Πg-a(3)Πu system. The bands, observed by resonant 2-photon ionization spectroscopy and time-of-flight mass spectrometry, were identified through a synergy of high-level ab initio computation and double-resonance spectroscopy. Two bands are firmly identified, 1-3 and 0-2, allowing the 4(3)Πg origin to be placed at 51496.44 cm(-1). The 4(3)Πg state is characterized as having a single bond, with a vibrational frequency of about 1268 cm(-1), and an equilibrium bond length of 1.57 Å. The state is predicted to exhibit a barrier to dissociation, with a rotational constant that unusually increases with vibrational excitation up to a maximum before decreasing at higher vibrational excitation. The new band system allows us to probe the a(3)Πu state of C2 through a straightforward 1 + 1 REMPI scheme.
authors.affiliation: School of Chemistry, UNSW , Sydney, NSW 2052, Australia.
authors.forename: Olha
authors.initials: O
authors.lastname: Krechkivska
authors.affiliation: School of Chemistry, The University of Sydney , Sydney, NSW 2006, Australia.
authors.forename: George B
authors.initials: GB
authors.lastname: Bacskay
authors.affiliation: School of Chemistry, The University of Sydney , Sydney, NSW 2006, Australia.|Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Tyler P
authors.initials: TP
authors.lastname: Troy
authors.affiliation: School of Chemistry, UNSW , Sydney, NSW 2052, Australia.
authors.forename: Klaas
authors.initials: K
authors.lastname: Nauta
authors.affiliation: School of Chemistry, UNSW , Sydney, NSW 2052, Australia.
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Kreuscher
authors.affiliation: School of Chemistry, UNSW , Sydney, NSW 2052, Australia.
authors.forename: Scott H
authors.initials: SH
authors.lastname: Kable
authors.affiliation: School of Chemistry, UNSW , Sydney, NSW 2052, Australia.
authors.forename: Timothy W
authors.initials: TW
authors.lastname: Schmidt