Vibration–rotational spectra of GaF and molecular properties of diatomic fluorides of elements in group 13

Abstract

From new measurements of vibration–rotational spectra of ⁶⁹Ga¹⁹F and ⁷¹Ga ¹⁹F in absorption with laser diodes in the wavenumber region 54 800 ⩽/m^–1⩽ 63 800, we evaluated radial coefficients that serve to reproduce the wavenumbers of 229 IR lines and published frequencies of 27 microwave lines within small uncertainties. The maximum range of validity of radial functions is 1.57 ⩽R/10^–10 m ⩽ 2.10, and R_e=(1.774 341 0 ± 0.000 001 5)× 10^–10 m, after corrections for non-adiabatic effects. For comparison with results of GaF and TIF previously reported, we analysed published microwave and IR spectra of BF, AIF and InF; maximum ranges of validity of pertinent radial functions and a table of parameters are presented. For BF we find experimental evidence for the sense ^–BF⁺ of electric polarity.