Abstract
A device for rapidly cooling small amounts of sample to 15 K is described. The device employs a thin brass belt connected at the ends to form a loop. At one end, the loop is in contact with the cold stage of a closed-cycle helium refrigerator. Samples (50 ..mu..L) are injected through a septum in the vacuum chamber onto the cold portion of the belt. After the analysis, the belt carries the sample away from the cold stage where it warms and evaporates. The cooling device is therefore self-cleaning. In this study, 11 polynuclear aromatic hydrocarbons (PAHs) dissolved in Shpol'skii solvents are determined by xenon arc excited low-temperature molecular luminescence spectrometry.
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