Abstract
Experiments on the unimolecular decomposition of ion clusters of the type Ar n -(CH 3) 2O + to form Ar n -CH 3OCH 2 + and Ar n -CHO +, show the total product ion intensity to be sensitive to the stagnation pressure behind the expansion nozzle. At suffiently low pressures it is possible to form Ar n -(CH 3) 2O + clusters alone with no evidence of any product ions. As the nozzle pressure is increased so the total product ion intensity is observed to increase also. These results are interpreted in terms of the argon component of tile cluster undergoing a transition from a liquid-like to a solid-like state.
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