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|  | From John Langley:
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|  | {{Sugdef|Collisional Excitation
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|  | |An ion/neutral process wherein the internal energy of a (slow) reactant ion increases at the expense of the translational energy of either (or both) of the reacting species. The scattering angle may be large. 
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|  | ::--[[User:Kkmurray|K. Murray]] 22:19, 2 Mar 2005 (CST)
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