Millimeter- and Submillimeter-Wave Spectra and Molecular Constants of Silver Chloride

A new type of high-temperature spectrometer for operation in the millimeter- and submillimeter-wave regions has been constructed and used for measurements of numerous rotational transitions of AgCl at 750^∘{}C. Significant improvement in sensitivity over other high-temperature spectrometers operating in the submillimeter region has been achieved. With it, rotational lines of AgCl up to a frequency of 366 858.51 Mc/sec (λ=0.8 mm) have been measured with high precision. The molecular constants obtained are. For Ag¹⁰⁷{Cl}³⁵$, ${B}ₑ=3686.9639$ Mc/sec, ${{α}}ₑ=17.8498$ Mc/sec, ${{γ}}ₑ=0.01883$ Mc/sec, ${D}ₑ=1.8903$ kc/sec, ${{ω}}ₑ=343.52$ ${cm}^{{-}1}$, ${{ω}}ₑ{x}ₑ=1.169$ ${cm}^{{-}1}$, ${r}ₑ=2.28078; for{Ag}¹⁰⁹Cl³⁵, Bₑ=3670.2777 Mc/sec, αₑ=17.7284 Mc/sec, γₑ=0.01859 Mc/sec, Dₑ=1.8739 kc/sec, ωₑ=342.68 cm^-1, ωₑxₑ=1.163 cm^-1, rₑ=2.280779 {}; for Ag¹⁰⁷{Cl}³⁷$, ${B}ₑ=3536.8734$, ${{α}}ₑ=16.7705$ Mc/sec, ${{γ}}ₑ=0.01708$ Mc/sec, ${D}ₑ=1.7383$ kc/sec, ${{ω}}ₑ=336.58$ ${cm}^{{-}1}$, ${{ω}}ₑ{x}ₑ=1.118$ ${cm}^{{-}1}$, ${r}ₑ=2.280781; for{Ag}¹⁰⁹Cl³⁷, Bₑ=3520.1846 Mc/sec, αₑ=16.6520 Mc/sec, γₑ=0.01710 Mc/sec, Dₑ=1.7192 kc/sec, ωₑ=336.04 cm^-1, ωₑxₑ=1.121 cm^-1, rₑ=2.280782.