Features of the xenon excimer VUV spectra formation

Abstract

The change in the shape of xenon dimers second continuum spectrum (3,1Σ+u→1Σ+g), excited in a barrier discharge (P = 300 Torr), depending on the gas temperature is studied. It was found that an increase in the gas temperature from Т = 500 K to 1300 K leads to a broadening of the continuum at half maximum from Δλ = 15 nm to Δλ = 20.5 nm and a shift of its maximum to the short-wave region from λ = 173.2 nm to λ = 172.5 nm. The relative increase in intensity occurred in the short-wavelength wing, while the position of the short-wavelength continua boundary did not depend on temperature.The shape of the second continuum of krypton dimers experienced much smaller changes under similar excitation conditions, which was explained by the lower heating of the gas and the lower change in the relative population of the vibrational levels.