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A cryostat designed to cool specimens with cold gas has been constructed. Its working temperature range is from room temperature to 4.38 K, although it is normally operated down to 5.1 K. Three specimens can be mounted in the cryostat simultaneously, and their temperature can be reduced at as slow a rate as 0.1°C/min. The luminescence emitted from the specimens over a solid angle of about 0.26 sr is collected and guided to a monochromator.
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Matsui et al. (1984) studied this question.
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