title: Observation of the 71Pig state of Na2 by optical-optical double resonance spectroscopy.
abstract: The 71Pig Rydberg state of Na2 correlating with the separated atom limit Na(3s) + Na(5p) has been observed using high-resolution cw optical-optical double resonance spectroscopy. A total of 104 identified rovibrational levels in the range v = 0-12 and 11 </= J </= 44 have been assigned to the 71Pig state. Dunham coefficients were determined, and the Rydberg-Klein-Rees potential curve in the range of R = 2.99-4.66 A was derived for the 71Pig state using the observed quantum levels. The important molecular properties are the potential minimum Te = 36 633.00(23) cm-1 at Re = 3.6313(29) A, omegae = 115.75(13) cm-1, and Be = 0.111 22(17) cm-1. A detailed discussion of this investigation of the 71Pig state is provided.
authors.affiliation: Department of Physics, National Cheng-Kung University, Tainan 70101, Taiwan.
authors.forename: Chanchal
authors.initials: C
authors.lastname: Chaudhuri
authors.forename: Ray-Yuan
authors.initials: RY
authors.lastname: Chang
authors.forename: Wei-Xiang
authors.initials: WX
authors.lastname: Chen
authors.forename: Wei-Chia
authors.initials: WC
authors.lastname: Fang
authors.forename: Jun-Ping
authors.initials: JP
authors.lastname: Cheng
authors.forename: Thou-Jen
authors.initials: TJ
authors.lastname: Whang
authors.forename: Chin-Chun
authors.initials: CC
authors.lastname: Tsai