title: [Collisional excitation transfer between Na2(B 1pi(u)) and Na2(2 1sigma(g)+)].
abstract: The B 1pi(u) electronic state of Na2 was excited by the 441.6 nm He-Cd laser line. The Na atomic transitions and the A 1sigma(u)+ --> X 1sigma(g)+ band of Na2 were recorded. From the intensities and spectra of the Na and Na2 fluorescence several collisional processes in the excited sodium atom-dimer system were identified. The Na atomic lines are the result of collisional energy transfer from Na2 (B 1pi(u)) to Na(3P). Predissociation process may also contribute to atomic fluorescence. The A 1sigma(u)+ --> X 1sigma(g)+ band is interpreted through a populating mechanism involving collisional transfer from B 1pi(u) to 2 1sigma(g)+ followed by a radiative transfer to the A 1sigma(u)+ state. From the decay constants and fluorescence intensities, the rate coefficient at 360 degrees C for collisional energy transfer from Na2 (B 1pi(u)) to Na2 (2 1sigma(g)+) was found to be 5.7 x 10(-10) cm3 x s(-1). The predissociation rate of the B 1pi(u) is 2.7 x 10(6) s(-1).
authors.affiliation: Department of Physics, Xinjiang University, Urumqi 830046, China.
authors.forename: Zhen-zhou
authors.initials: ZZ
authors.lastname: Lei
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Xiao-yan
authors.initials: XY
authors.lastname: Zhou
authors.forename: Kang
authors.initials: K
authors.lastname: Dai
authors.forename: Yi-fan
authors.initials: YF
authors.lastname: Shen
mesh_terms: D000465:Algorithms; D004735:Energy Transfer; D007700:Kinetics; D008956:Models, Chemical; D012964:Sodium / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013816:Thermodynamics
chemical_list: D012964:Sodium