Kinetics of vacuumhyphen;ultraviolet continuum from a highhyphen;pressure He fast discharge

摘要

The kinetics of atomic and molecular excited states following a fast discharge in pure highhyphen;pressure helium are resolved on a nanosecond time scale by emission and absorption spectroscopy. Evidence is presented indicating that the Hopfield continuum (600ndash;1100 Aring;) radiation occurs as a terminal process in a collisionalhyphen;radiative cascade subsequent to the electronic recombination of He+2ions. The radiated peak power in this wavelength range reaches several kW at atmospheric pressure.