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Efficiency = (intensity of 84Kr+) / (intensity of MKr+ + intensity of incident ion).cell. These two ions show little charge exchange. However, the very large reduction in the intensity of the m/z 28 CO+ with Kr in the collision chamber with respect to no Kr in the collision chamber indicates a very high degree of charge exchange. Also, both N2 and Ar have higher ionization potentials than CO. We are examining this phenomenon further to determine the mechanisms by which this occurs, to allow the extension of the technique to other analytical problems. ACKNOWLEDGMENTWe gratefully acknowledge the help of Ken Foster in carrying out the experiments. We also thank Phil Miller, Tom Coburn, Susan Oh, and Alan Burnham for useful technical discussions.

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