The infra-red absorption spectrum of potassium chlorate crystals: Part II

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 at ω ₁ (930 cm.^-1, 10·75μ ),ω₂ (975 cm.^-1, 10·26μ ),ω ₃ (620 cm.^-1, 16·13μ ) and ω ₄ (486 cm.^-1, 20·58μ ). It is noticed that ω ₃ is quite strong, while the corresponding Raman frequency comes out very weakly. The vibration ω ₁ is more strongly Raman-active than ω ₂, 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.