Abstract
Describes measurements of He II Balmer series line shapes and shifts, using both absorption and emission techniques, in a dense (Ne=2+or-0.5*1018 cm-3), cool (Te=3.4 eV) helium z-pinch plasma. Tunable coherent VUV radiation was generated around 1640 AA by Raman up-conversion in H2 and around 1215 AA by frequency tripling in krypton. An absorption measurement was made on the near wing profile of the He II Balmer-alpha line (1640 AA) using the Raman up-converted light source. Emission measurements were made on the He II Balmer-beta (1215 AA) line profile; these were complemented by an accurate wavelength calibration using the tunable coherent VUV light from the frequency tripled light source. A shift in the wavelength of the Balmer-beta line centre of 0.7+or-0.2 AA to the red was observed. Discussion is given of this shift in relation to existing theories of the plasma polarisation shift.
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