Polarizability Anisotropy of Hydrogen Fluoride

The hyperfine spectra for the J=1 and 2 states of hydrogen fluoride have been observed by molecular beam electric resonance spectroscopy. The observed Stark coefficients are corrected for centrifugal distortion and yield a value for the polarizability anisotropy, ${\text{α=0.220 ± 0.020\hspace{0.17em}Å}}^3$ . Differences in the values for the spin-rotation interactions are observed for the two rotational states and these are used to calculate ${\mathrm{dC}}_{\mathrm{F}}/\mathrm{dR}{\text{=(1.66± 0.10)× 10}}^3\hspace{0.17em}\mathrm{kHz}\mathrm{/\AA }$ and ${\mathrm{dC}}_{\mathrm{H}}/\mathrm{dR}{\text{=(2.5± 1.4)× 10}}^2\hspace{0.17em}\mathrm{kHz}\mathrm{/\AA }$ .