Radio-Frequency and Microwave Spectra of NaF by the Molecular-Beam Electric-Resonance Method

Abstract

Radio‐frequency transitions of the type (J, m_J±1)→(J, m_J) have been observed for ²³Na¹⁹F by the molecular‐beam electric‐resonance method. Spectra were observed for the first three vibrational states of the J=1 rotational level and for the first vibrational state of the J=2 rotational level. From the analysis of the radio‐frequency spectra, dipole moments μ_v, sodium quadrupole coupling constants (eQq)_v, spin—rotation interaction constants c_Na and c_F, and spin—spin interaction constants c₃ and c₄ were determined for ²³Na¹⁹F. Observations of J=1→J=0 microwave transitions yielded rotational constants B_v for the v=0, 1, and 2 vibrational states. The molecular constants determined for ²³Na¹⁹F are: $$\begin{array}{c}{\mu }_v\text{=8.12349+0.06436(v+}\frac{1}{2}\text{)+0.00037(v+}\frac{1}{2}{)}^2\text{±0.001\hspace{0.17em}}\mathrm{D},\\ {\mathrm{(eQq)}}_0\text{=−8440.1±1.5\hspace{0.17em}}\mathrm{kc}/\sec {\mathrm{;(eQq)}}_1\text{=−8327.9±1.5\hspace{0.17em}}\mathrm{kc}/\sec {\mathrm{;(eQq)}}_2\text{=−8220.5±2.0\hspace{0.17em}}\mathrm{kc}/\sec ,\\ c_{\mathrm{Na}}\text{=1.4±0.5\hspace{0.17em}}\mathrm{kc}/\sec ,\\ c_{\mathrm{F}}\text{=2.0±0.3\hspace{0.17em}}\mathrm{kc}/\sec ,\\ c_3\text{=3.85±0.25\hspace{0.17em}}\mathrm{kc}/\sec ,\\ c_4\text{=0.0}\begin{array}{c}\text{+0.4\hspace{0.17em}}\mathrm{kc}/\sec \\ \text{−0.1\hspace{0.17em}}\mathrm{kc}/\sec ,\end{array}\\ B_0\text{=13029.811±0.002\hspace{0.17em}}\mathrm{Mc}/\sec {\mathrm{,B}}_1\text{=12894.543±0.003\hspace{0.17em}}\mathrm{Mc}/\sec {\mathrm{,B}}_2\text{=12760.674±0.004\hspace{0.17em}}\mathrm{Mc}/\sec .\end{array}$$