With CO
2 laser pulses, SF
6 in Kr matrix on a ca. 50K Ge substrate is irradiated at a rate of 1 pulse/2 min, and the released gas is analysed with a quadrupole mass spectrometer. The amounts of
32SF
6 and
34SF
6 in the released gas decrease rapidly with laser shots, and the semilogarithmic plots of these amounts lie on straight lines for the first several shots. The rate constant on releasing
32SF
6 (k32) is smaller than that on.
34SF
6 (k 34).when
32SF
6 v
3 vibration is excited with 10-μmP (30) pulses, whereas k
32 islarger than k
34, when
34SF
6 v
3 is excited with 10-μm P (48) pulses. These experimentalresults likely lead us to a conclusion that laser-spattering for the nonexcited isotopeis ready to be released when one isotope in a matrix is excited with infrared laserpulses.
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