title: The Na2 2 3pi(g) state: new observations and hyperfine structure.
abstract: Many more Na2 2 3pi(g) v = 0-43, omega = 0, 1, 2 levels have been observed by sub-Doppler continuous wave perturbation facilitated optical-optical double resonance fluorescence excitation spectroscopy and the hyperfine structure of the omega = 0 and 2 levels has been resolved. New molecular constants for the less perturbed v = 0-43 levels have been obtained with these new and the previously reported data. The hyperfine coupling scheme of the observed 2 3pi(g) levels is close to Hund's case a(beta) with a Fermi contact constant b(F) = 160+/-5 MHz, which is smaller than the Fermi contact constants of other Na2 triplet Rydberg states, b(F) = 200-245 MHz.
authors.affiliation: Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Qi
authors.forename: Guenadiy
authors.initials: G
authors.lastname: Lazarov
authors.forename: A Marjatta
authors.initials: AM
authors.lastname: Lyyra
authors.forename: Yaoming
authors.initials: Y
authors.lastname: Liu
authors.forename: Chengzhe
authors.initials: C
authors.lastname: Cui
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Gwang-Hi
authors.initials: GH
authors.lastname: Jeung