The observation of stimulated emission in the 119 to 149 nm range from HD excited by picosecond 193 nm radiation

摘要

Intense stimulated emission in the 119 to 149 nm region is observed from HD excited by two quanta at 193 nm. For certain transitions, the conversion efficiency approaches 1percnt; so that peak powers of sim;10 MW are produced. Electron collisions with the HD (E,F) level are found to efficiently transfer population to the HD(C) state which produces stimulated emission on severalCthinsp;rarr;thinsp;XWerner band lines in the vicinity of 120 nm. The data on the pressure dependence of the stimulated signals strongly support the conclusion that, in comparison to H2, HD exhibits a large isotopic dependence on the cross section for rotationally inelastic electron collisions in electronically excited states. The rate constant for this rotationally inelastic process is estimated as sim;2times;10minus;7cm3/s. This is the first observation of an isotopically sensitive electron collisional process involving an electronically excited level.