Dissociation of OCS by high energy highly charged ion impact

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• 作者：Mridula Rani Jana ; Pradip N. Ghosh ; Biswajit Ray…
• 关键词：Atomic and Molecular Collisions
• 刊名：The European Physical Journal D - Atomic, Molecular and Optical Physics
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：68
• 期：9
• 全文大小：884 KB
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• 作者单位：Mridula Rani Jana (1)
  Pradip N. Ghosh (1)
  Biswajit Ray (1)
  Bhas Bapat (2)
  Rajesh Kumar Kushawaha (2)
  Koushik Saha (2)
  Ishwar A. Prajapati (2)
  C. P. Safvan (3)
  
  1. Department of Physics, University of Calcutta, 92, A.P.C. Road, 700009, Kolkata, India
  2. Physical Research Laboratory, 380009, Ahmedabad, India
  3. Inter-University Accelerator Centre, Aruna Asaf Ali Marg, 110067, New Delhi, India
  
• ISSN：1434-6079

文摘

Various dissociation channels of OCS q+ (where q = 2 to 4), formed in the interaction of 5 MeV u-1 Si12+ ion beam with neutral OCS, have been studied using recoil–ion momentum spectroscopy. The concerted and/or sequential nature of dissociation is inferred from the shape and slope of the coincidence islands in the 2D coincidence map. It is observed that the C+ + S+ + O channel results from concerted as well as sequential decay of OCS2+. However the other channels originate purely from the concerted process in which the two terminal fragments (oxygen and sulphur) fly back to back and the central carbon fragment is left with negligible momentum. The kinetic energy release (KER) distributions for all the fragmentation channels arising from the dissociation of OCS q+ (where q = 2 to 4) have been measured and compared with the available data in the literature. It is observed that the KER values for complete Coulomb fragmentation channels are much smaller than those of incomplete Coulomb fragmentation cases and the KER increases with the increasing charge states of the parent molecular ions. From the momentum correlation map, we estimated the geometry of the precursor molecular ion undergoing three–body dissociation and inferred that bent dissociative states are involved in most of the fragmentation channels of OCS q+.