Molecular dissociation of SF6 by ultra-short CO2 laser pulses |
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Authors: | Paul Kolodner C Winterfeld Eli Yablonovitch |
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Institution: | Gordon McKay Laboratory, Harvard University, Cambridge, Mass. 02138, USA |
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Abstract: | We have measured the absolute dissociation probability of SF6 gas irradiated by CO2 laser pulses varying in duration from 0.5 nsec to 100 nsec. We find a threshold for dissociation of ? 1.4 J/cm2, independent of pulse duration. For fixed energy density, the dissociation probability increases as the pulse duration decreases, but not nearly to the degree expected from theory. We have also determined the dissociation probability in the ν2 + ν6 combination band and find it to be 103 times less than in the ν3 band, in contradiction to some conclusions recently reported by Ambartzumian et al. The dissociation mechanism takes place without collisions, and if collisions occur, they tend to be detrimental to the dissociation rate. |
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