Hellberg Fredrik, Zhaunerchyk Vitali, Ehlerding Anneli, Geppert Wolf D, Larsson Mats, Thomas Richard D, Bannister Mark E, Bahati Eric, Vane C Randy, Osterdahl Fabian, Hlavenka Petr, af Ugglas Magnus
Department of Physics, Stockholm University, AlbaNova, S-106 91, Stockholm Sweden.
J Chem Phys. 2005 Jun 8;122(22):224314. doi: 10.1063/1.1930830.
This paper presents results concerning measurements of the dissociative recombination (DR) of dihydrogen sulfide ions. In combination with the ion storage ring CRYRING an imaging technique was used to investigate the breakup dynamics of the three-body channel in the DR of 32SD2(+). The two energetically available product channels S(3P) + 2D(2S) and S(1D) + 2D(2S) were both populated, with a branching fraction of the ground-state channel of 0.6(0.1). Information about the angle between the two deuterium atoms upon dissociation was obtained together with information about how the available kinetic energy was distributed between the two light fragments. The recombination cross sections as functions of energy in the interval of 1 meV to 0.3 eV in the center-of-mass frame are presented for 34SH2(+). The thermal rate coefficient for the DR of 34SH2(+) was determined to be (4.8+/-1.0) x 10(-7)(T/300)(-0.72+/-0.1) cm3 s(-1) over this interval.
本文介绍了关于硫化氢离子解离复合（DR）测量的结果。结合离子储存环CRYRING，采用成像技术研究了(^{32}SD_2^+)解离复合过程中三体通道的破裂动力学。两个能量上可行的产物通道(S(^3P)+2D(^2S))和(S(^1D)+2D(^2S))均被占据，基态通道的分支比为(0.6(0.1))。获得了关于解离时两个氘原子之间夹角的信息，以及关于可用动能在两个轻碎片之间如何分配的信息。给出了(^{34}SH_2^+)在质心参考系中1 meV至0.3 eV能量区间内作为能量函数的复合截面。在此区间内，(^{34}SH_2^+)解离复合的热速率系数确定为((4.8\pm1.0)\times10^{-7}(T/300)^{-0.72\pm0.1}\ cm^3\ s^{-1})。
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