Methyl-d3-chloride and methyl-d3-bromide have been synthesized, their infra-red spectrum in the range from 2.8 to 18μ measured, and a complete assignment of the fundamental frequencies has been given. A modified valence-type potential function including two interaction terms fits the fundamental frequencies of the four molecules CH3Cl, CD3Cl, CH3Br, and CD3Br to within one percent.
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Hermann D. Noether (1942) studied this question.
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