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°K InSb photoconducting detector. The following results have been obtained: for H ${}_{}{}^{35}{}_{}{}^{}\mathrm{Cl}$, $B_0=312\mathrm{} 989.297\pm 0.020$ Mc/sec, $D_0=15.836\mathrm{}$ Mc/sec, $r_e=1.274\mathrm{} 5991$ Å; for H ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}$, $B_0=312\mathrm{} 519.121\pm 0.020$ Mc/sec, $D_0=15.788\mathrm{}$ Mc/sec, $r_e=1.274\mathrm{} 5990$ Å; for D ${}_{}{}^{35}{}_{}{}^{}\mathrm{Cl}$, $B_0=161\mathrm{} 656.238\pm 0.014$ Mc/sec, $D_0=4.196\mathrm{}\pm 0.003$ Mc/sec, $r_e=1.274\mathrm{} 5990$ Å; for D ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}$, $B_0=161\mathrm{} 183.122\pm 0.016$ Mc/sec, $D_0=4.162\mathrm{}\pm 0.003$ Mc/sec, $r_e=1.274\mathrm{} 5988$ Å; for H ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}$, $B_0=192\mathrm{} 657.577\pm 0.019$ Mc/sec, $D_0=6.203\mathrm{}\pm 0.003$ Mc/sec, $r_e=1.609\mathrm{} 018$ Å; for D ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}$, $B_0=97\mathrm{} 537.092\pm 0.009$ Mc/sec, $D_0=1.578\mathrm{}\pm 0.001$ Mc/sec, $r_e=1.609\mathrm{} 018$ Å; for D ${}_{}{}^{79}{}_{}{}^{}\mathrm{Br}$, $B_0=127\mathrm{} 357.639\pm 0.012$ Mc/sec, $D_0=2.6529\mathrm{}\pm 0.0014$ Mc/sec, $r_e=1.414\mathrm{} 4698$ Å; for D ${}_{}{}^{81}{}_{}{}^{}\mathrm{Br}$, $B_0=127\mathrm{} 279.757\pm 0.017$ Mc/sec, $D_0=2.6479\mathrm{}\pm 0.0020$ Mc/sec, $r_e=1.414\mathrm{} 4698$ Å; for D ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$, $B_0=325\mathrm{} 584.98\pm 0.300$ Mc/sec, $D_0=17.64\mathrm{}$ Mc/sec, $r_e=0.916\mathrm{} 914$ Å.