文献类型：期刊文献

英文题名：Vibrational Energy Transfer from Vibrational Levels of RbH(X ¹Σ⁺, ν=0～2) to H₂

作者：Shen Xiao-yan[2];Wang Shu-ying[1];Liu Jing[1];Dai Kang[1];Shen Yi-fan[1]

机构：[1]Xinjiang Univ, Sch Phys, Urumqi 830046, Peoples R China;[2]E China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：31

期号：1

起止页码：39

外文期刊名：SPECTROSCOPY AND SPECTRAL ANALYSIS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000286290900009)】；

语种：英文

外文关键词：Vibrational energy transfer; Time resolved fluorescence; Integrated profiles method; Rate coefficient; RbH molecule

摘要：The vibrational energy transfer from vibrational levels of RbH(X-1 Sigma(+) nu=0 similar to 2) by collision with H-2 was determined using the integrated time-resolved laser induced fluorescence (LW) in a five-arm crossed heat-pipe oven. Rb-H-2 mixture was irradiated with pulses of 696. 4 nm radiation from a OPO laser, populating 6D state by two-photon absorption. The vibrational levels of RbH(X-1 Sigma(+)) generated in the reaction of Rb(6D) and H-2 were detected by LIF technique. The nascent quantum state distributions of RbH were obtained when the delay time between the pump and probe laser was 20 ns. The nascent RbH product molecules were found to populate the lowest three vibrational (nu=0, 1, 2) levels of the ground electronic state but could not be detected in any higher vibrational state. The integrated time-resolved LIF excited A(1)Sigma(+) -> X-1 Sigma(+) system in the presence of H2 was recorded with delay time from 0 to 10 mu s. The RbH signal of nu=0, 1 levels first increased and then decreased on a larger time scale. RbH was created instantaneously then was quenched by collision and diffused. The rate equations for the population of the vibrational levels were given. The integrated profiles method permitted us to determine the rate coefficients for vibrational transfer of RbH(X-1 Sigma(+), nu=0 similar to 2) by collision with H-2. The rate coefficients for collisional transfer of RbH(X-1 Sigma(+)) by collisions with H-2 are(in units of 10(-11) cm(3) . s(-1)) 3. 4 +/- 0. 8 and 2. 8 +/- 0. 6 for nu=2 ->nu=1 and nu=1 ->nu=0 respectively. The diffusion rates of nu=0, 1, 2 are(in units of 10(5) s(-1)) 4.9 +/- 1. 1, 1.0 +/- 0. 3a nd 0. 6 +/- 0. 2, respectively. The experiment showed that vibrational relaxation from RbH(X-1 Sigma(+), nu=0 similar to 2) was more efficient compared to that of other vibrational levels studied here.