title: Experimental study of the 39K2 2 3Pi(g) state by perturbation facilitated infrared-infrared double resonance and two-photon excitation spectroscopy.
abstract: The 39K2 2 3Pi(g) state has been observed by perturbation facilitated infrared-infrared double resonance and two-photon excitations. The vibrational numbering of the 2 3Pi(g) levels was determined by resolved fluorescence into the bound levels as well as to the continuum of the a 3Sigma(u)+ state. The rotational assignment of the 2 3Pi(g) levels excited by two-photon transitions was determined from excitation frequencies and resolved fluorescence into the bound levels of the a 3Sigma(u) + and b 3Pi(u) states. Molecular constants obtained from these observed levels agree with theoretical constants.
authors.affiliation: Department of Physics and Key Lab of Atomic and Molecular Nanosciences, Tsinghua University, Beijing 100084, China.
authors.forename: Yizhuo
authors.initials: Y
authors.lastname: Chu
authors.forename: Feng
authors.initials: F
authors.lastname: Xie
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: V B
authors.initials: VB
authors.lastname: Sovkov
authors.forename: V S
authors.initials: VS
authors.lastname: Ivanov
authors.forename: A M
authors.initials: AM
authors.lastname: Lyyra