Improved inverse photoemission detector

An inverse photoemission detector of the Geiger–Müller type is described, with a detection energy of 10.6 eV and resolution of 0.6 eV. The window material is MgF2 and the detecting gas is dimethyl ether, with argon as the multiplier gas. The detector offers a number of advantages compared with the conventional I2 /CaF2 detector, including a detection energy higher than that of previous detectors, insensitivity to temperature variations, and ease of handling because the detector gas is neither corrosive nor highly poisonous.