Observation of Extremely High Vibrational Excitation in O2 from Inelastic Scattering of Rydberg H Atom with O2

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• 作者：Shengrui Yu ; Shu Su ; Kaijun Yuan ; Dongxu Dai ; Xueming Yang
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：September 6, 2012
• 年：2012
• 卷：3
• 期：17
• 页码：2420-2424
• 全文大小：347K
• 年卷期：v.3,no.17(September 6, 2012)
• ISSN：1948-7185

文摘

The state-resolved differential cross sections for the Rydberg-atom (RA) inelastic scattering process H*(n = 46) + O₂(v = 0, j = 1,3) 鈫?H*(n鈥? + O₂(v鈥? j鈥? 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.

Keywords:

inelastic scattering; differential cross sections; Rydberg atom