Abstract
Two-photon polarisation spectroscopy and two-photon laser-induced fluorescence have been used as sensitive techniques for the measurement of high and low atomic hydrogen number densities, respectively, in high-temperature environments far away from local thermodynamic equilibrium. In addition, Stark-broadened spectral line profiles of the 1S-2S transition of atomic hydrogen were measured with Doppler-free two-photon polarisation spectroscopy in order to test Stark broadening theory at low electron densities. The paper expounds briefly some of the basic properties of these techniques and presents experimental results.
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