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Fig. 3


VUV spectra in the 110–180 nm range of a T-type geometry MDHL, the H2/D2 partial pressure is kept at 0.41 mbar. The effect of adding helium with the H2 or D2 is clearly shown. Photon flux (y-axis) estimations are based on NIST photodiode measurements. Emission at ~130, ~149, and ~175 nm indicate traces of oxygen and nitrogen.

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