Abstract
PHOTOCHEMICAL studies of aqueous solutions of organic compounds are being carried out at this Laboratory using the 1849 A. radiation emitted by a low-pressure mercury resonance lamp. It has been found necessary to eliminate the contribution of the intense 2537 A. line emitted by such a source. This has been done by using a filter of irradiated lithium fluoride. The idea of using this material as the filter for mercury resonance radiation was suggested tous by P. Yuster of this Laboratory. The absorption spectrum of X-irradiated lithium fluoride shows a sharp band with a maximum at 2420 A. due to the formation of F-centres in the crystal1. Even with complete absorption at this wave-length, the transmission of the irradiated crystal remains high at 1849 A.
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