Abstract
By using the frequency-doubled light of a single-mode dye laser the effect of noble gas collisions (Ne and Xe) on the intensities of the Rb principal series lines 5S-nP (n≧15) has been studied in a thermionic diode. The signal intensities of the low-lying lines of the series could be increased considerably by applying higher noble-gas pressures. The intensities of the high-lying lines were found to be pressure independent indicating a constant ionisation probability of highly excited atoms by collisions. By comparing the diode signals of the discrete lines with the ionisation continuum it is shown that the ionisation probability of high-lying levels is unity within the experimental error.
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