SeF₆ vibrational band contours studied by low temperature and matrix isolation spectroscopy, using isotope substitution

Abstract

The infra-red spectrum of SeF₆ was studied using matrix isolation spectroscopy, and isotope substitution techniques. The I.R. band contours of v ₃(F _1u ) and v ₄(F _1u ) could be well analysed by measuring the spectrum of isotopically pure ⁸⁰SeF₆ at low temperature. For both vibrations, isotope shifts due to the different selenium isotopes were obtained in both Ar and N₂ matrices. The F _1u force constants have been calculated using isotope shifts and Coriolis coupling constants as additional data.