Abstract
This apparatus is designed to collect as much as possible of the light emitted from the surface of a solid specimen, while giving a minimum unwanted signal due to backscattered electrons. The light collector is a mirror in the shape of an ellipsoid of revolution, with the specimen at one focus and an optical microscope objective lens below the other focus. From the lens the light is led out of the vacuum by fibre optic light guides. For studies at room temperature, a wide-band spectrometer has been used in the range 400-700 nm. This spectrometer, which is based on a continuous interference filter, gives a minimum loss of light intensity.
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