Submillimeter-Wave Spectra and Equilibrium Structures of the Hydrogen Halides

Abstract

Rotational transitions of a number of isotopic species of the hydrogen halides have been measured in the 1.0- to 0.38-mm wavelength region of the spectrum. These transitions have been measured with a submillimeter-wave spectrometer which employs a klystron-driven crystal harmonic generator and a 1.6\ifmmode^\circ\else\textdegree\fi{}K InSb photoconducting detector. The following results have been obtained: for H $^{35}\mathrm{Cl}$, ${B}_{0}=312 989.297\ifmmode\pm\else\textpm\fi{}0.020$ Mc/sec, ${D}_{0}=15.836$ Mc/sec, ${r}_{e}=1.274 5991$ \AA{}; for H $^{37}\mathrm{Cl}$, ${B}_{0}=312 519.121\ifmmode\pm\else\textpm\fi{}0.020$ Mc/sec, ${D}_{0}=15.788$ Mc/sec, ${r}_{e}=1.274 5990$ \AA{}; for D $^{35}\mathrm{Cl}$, ${B}_{0}=161 656.238\ifmmode\pm\else\textpm\fi{}0.014$ Mc/sec, ${D}_{0}=4.196\ifmmode\pm\else\textpm\fi{}0.003$ Mc/sec, ${r}_{e}=1.274 5990$ \AA{}; for D $^{37}\mathrm{Cl}$, ${B}_{0}=161 183.122\ifmmode\pm\else\textpm\fi{}0.016$ Mc/sec, ${D}_{0}=4.162\ifmmode\pm\else\textpm\fi{}0.003$ Mc/sec, ${r}_{e}=1.274 5988$ \AA{}; for H $^{127}\mathrm{I}$, ${B}_{0}=192 657.577\ifmmode\pm\else\textpm\fi{}0.019$ Mc/sec, ${D}_{0}=6.203\ifmmode\pm\else\textpm\fi{}0.003$ Mc/sec, ${r}_{e}=1.609 018$ \AA{}; for D $^{127}\mathrm{I}$, ${B}_{0}=97 537.092\ifmmode\pm\else\textpm\fi{}0.009$ Mc/sec, ${D}_{0}=1.578\ifmmode\pm\else\textpm\fi{}0.001$ Mc/sec, ${r}_{e}=1.609 018$ \AA{}; for D $^{79}\mathrm{Br}$, ${B}_{0}=127 357.639\ifmmode\pm\else\textpm\fi{}0.012$ Mc/sec, ${D}_{0}=2.6529\ifmmode\pm\else\textpm\fi{}0.0014$ Mc/sec, ${r}_{e}=1.414 4698$ \AA{}; for D $^{81}\mathrm{Br}$, ${B}_{0}=127 279.757\ifmmode\pm\else\textpm\fi{}0.017$ Mc/sec, ${D}_{0}=2.6479\ifmmode\pm\else\textpm\fi{}0.0020$ Mc/sec, ${r}_{e}=1.414 4698$ \AA{}; for D $^{19}\mathrm{F}$, ${B}_{0}=325 584.98\ifmmode\pm\else\textpm\fi{}0.300$ Mc/sec, ${D}_{0}=17.64$ Mc/sec, ${r}_{e}=0.916 914$ \AA{}.