The infrared spectra of TCl35, TCl37, and TBr79,81have been observed using a CaF2prism. Throughout this paper the notation TBr79,81indicates the natural isotopic mixture of Br79and Br81, and lack of spectral resolution of the two isotopes. A least squares treatment of the data yielded the following molecular constants for TBr79,81, TCl35, and TCl37, respectively:ngr;0equals;1519.26,thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;1739.10,thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;1735.51thinsp;cmminus;1Beequals;thinsp;thinsp;2.899,thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;3.746,thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;3.723thinsp;cmminus;1agr;eequals;thinsp;thinsp;0.046,thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;0.061,thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;0.066thinsp;cmminus;1Deequals;thinsp;thinsp;4.5times;10minus;5thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;7.7times;10minus;5thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;thinsp;6.8times;10minus;5thinsp;cmminus;1
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