Spectroscopy of a windowless, electron-beam-pumped excimerlamp (EBEL) in the VUV spectral region of 50-200 nm

摘要

Increasing argon concentration results in significant intensity loss of the He2* emission, as well asa decrease of the nitrogen, oxygen and carbon impurity lines (c.f. Fig. 3). Though the measurement procedure started with evacuating the VUV spectrometer to 1E-6 mbar and subsequent rapid filling with purified helium to 1000 mbar, the spectra showed abundant impurity lines and merely minor helium dimer emission. The error in this procedure is under current investigation.