Abstract

A method for the measurement of kinetic energy distributions of ions produced in a laser microprobe mass spectrometer employing the energy cut-off property of an ion reflector has been developed. The method is insensitive to time of ion formation and to miscalibration of the flight-time equation, but requires accumulation of many spectra from uniform samples. When applied to elemental carbon foil, measurement of ion kinetic energy reveals that ionic species occur with different kinetic energy distributions. A substantial fraction of the ions having less kinetic energy than the full acceleration energy was observed.

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