Abstract

A gas discharge lamp is described suitable for producing the many-lined spectrum of hydrogen (85–160 nm) and the Hopfield continuum in helium (60–100 nm). It was designed for use with a windowless monochromator to study photoionization and operates at pressures below 50 Torr. The hydrogen lamp has a mode of operation which concentrates the discharge into the monochromator entrance slit.

© 1970 Optical Society of America

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