Kinetics of ion/molecule reactions in Xe++acteone system

A reaction of Xe+ ion with acetone and subsequent transformations of the product ions at a buffer gas pressure (He) of 1.1 Torr were studied by the flow reactor technique mass spectrometry. A kinetic scheme describing the evolution of the ionic composition has been determined. The rate constants of the key reactions involved in the scheme have been evaluated. A channel of the production of acetone cation in A state in a charge transfer reaction was observed. A production of slowly reacting isomer of the acetone cation in secondary reactions was detected. Its product in the reaction with acetone is the 'nonprotonated dimer'. The kinetics of the production of ternary ions - ( CH3CO+CH3COCH3)(m/e=101), CH3COCH3H+ (m/e=59) as well as the production of ions of the fourth generation ( CH3CO+(CH3COCH3)2) (m/e=159) and (CH3COCH3)2H+ was observed. CH3CO+ ion (m/e=43) was found as the main reaction product. The main pathways scheme of ionic transformations is shown. (nevyjel)