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Fig. 2


Experimental set-up at the INP Greifswald for VUV measurements, (DEU): Physikalisch Technische Bundesanstalt (PTB) calibrated D2 lamp, (AP): Aperture, 0.6 mm (diameter), (VA): Valve, (MI): Mirror, f = 1.5 m, (WI): MgF2 window, (PM): Photomultiplier, (MO): VUV-Monochromator (VM-505 Acton Research); 0.5 m, 1200 g/mm, (LA): Microwave Discharge Hydrogen-flow Lamp, (CA): Microwave Evenson cavity.

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