High pressure arcs

Technical limits of exitance also impose minima for the dimensions of medium-pressure light sources (length of arc, length and diameter of bulb), for example, medium-pressure (doped) mercury arcs, high-pressure sodium vapor lamps, and incandescent lamps. 

Irradiation. The thick sheets were irradiated with monochromatic light according to ref. [2] using an Applied Photophysics Model 5350 photo-irradiator equipped with a 900 W short arc high pressure xenon lamp, a f/3.4 monochromator and an exit lens of quartz providing illumination over an area of 1.3 by 2.4 cm at a distance of 16 cm from the lens. The illumination was uniform over the central area (0.8 by 1.7 cm) which was analyzed. The entrance slit of die monochromator was kept at 5 nm and the exit slit at 10 nm to secure enough output energy. Irradiations were performed at ambient temperatures (ca. 23°Q in air. 

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