COLLISIONLESS MULTI-PHOTON ENERGY DEPOSITION AND DISSOCIATION OF SF6

We have made careful absolute measurements of the collisionless multiphoton energy deposition in SF6 for CO2 laser pulses of varying duration and energy fluence. Likewise, we have also measured the absolute dissociation yields. An experimental plot of yield versus energy deposition shows that the energy distribution function is nearly thermal, becoming somewhat broader than thermal for the longer pulse durations. A bottlenecking effect" of molecules in the discrete level region is held responsible for this smearing of the population distribution function. © 1979 The American Physical Society."