Abstract
Crystals of potassium chlorate exhibit strong absorption bands in the infra-red at 10µ–10·8µ, and at 16·2µ and 20·3µ. These are identified with the active fundamentals atω1 (930 cm.−1, 10·75µ),ω2 (975 cm.−1, 10·26µ),ω3 (620 cm.−1, 16·13µ) andω4 (486 cm.−1, 20·58µ). It is noticed thatω3 is quite strong, while the corresponding Raman frequency comes out very weakly. The vibrationω1 is more strongly Raman-active thanω2, while the reverse appears to be the case in the infra-red. Absorptions are also observed at 5·3µ, 6·3µ and 6·9µ which are interpreted as first-order combinations among these four fundamental frequencies, while other bands at 13·5µ, 18µ and 18·75µ appear to be combinations of internal frequencies with low frequency lattice vibrations.
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