Yu Shengrui, Su Shu, Yuan Kaijun, Dai Dongxu, Yang Xueming
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road Dalian 116023, China.
J Phys Chem Lett. 2012 Sep 6;3(17):2420-4. doi: 10.1021/jz3010255. Epub 2012 Aug 20.
The state-resolved differential cross sections for the Rydberg-atom (RA) inelastic scattering process H*(n = 46) + O2(v = 0, j = 1,3) → H*(n') + O2(v', j') have been measured by using the H-atom Rydberg tagging time-of-flight (HRTOF) technique. Extensive vibrational excitation of O2 products has been observed at the two collision energies of 0.64 and 1.55 eV. Experimental results show that the O2 products in the low vibrationally excited states are clearly forward-scattered, whereas those in the highly vibrationally excited states are mainly backward-scattered. Partially resolved rotational structures were also observed and assigned. The striking observation of extremely high energy transfer from translational to vibrational excitation at the backward direction could be explained involving charge transfer between proton and O2 molecule and possibly complex formation during the scattering process.
利用氢原子里德堡标记飞行时间（HRTOF）技术，测量了里德堡原子（RA）非弹性散射过程H*(n = 46) + O2(v = 0, j = 1,3) → H*(n') + O2(v', j')的态分辨微分截面。在0.64和1.55 eV这两个碰撞能量下，观测到了O2产物广泛的振动激发。实验结果表明，低振动激发态的O2产物明显向前散射，而高振动激发态的O2产物主要向后散射。还观测并确定了部分分辨的转动结构。在向后方向上从平动到振动激发的极高能量转移这一显著观测结果，可以通过质子与O2分子之间的电荷转移以及散射过程中可能形成的复合物来解释。
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