FAR-INFRARED SPECTRUM OF THE $HC_{1}$ DIMER
TL;DRAbstract
The two high frequency modes of the HC1 dimer have been partially analyzed by Ohashi and $Pine.^{1}$ In an effort to identify and analyze the remaining 4 low frequency modes, we have recorded the spectra of $HC_{1}$ samples at low temperature (=140 K) with a long pathlength (20 m) in the $20-200 cm^{-1}$ far-infrared region. The spectra were obtained with a Bomem DA3.002 spectrometer at a resolution of $0.008 cm^{-1}$ which was chosen to match approximately the expected dimer pressure broadening for the sample pressures used (5-8 torr). In addition to the very strong pure rotational lines of the HC1 monomer, rather weak but very extensive and congested spectral features were observed over almost the entire region studied; most if not all of these features are probably due to $(HC_{1})_{2}$. So far, we have tentatively assigned a band with an origin near $150 cm^{-1}$ that appears to be the torsional fundamental of the dimer. It is analogous to the HF dimer band recently reported by von
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The two high frequency modes of the HC1 dimer have been partially analyzed by Ohashi and $Pine.^{1}$ In an effort to identify and analyze the remaining 4 low frequency modes, we have recorded the spectra of $HC_{1}$ samples at low temperature (=140 K) with a long pathlength (20 m) in the $20-200 cm^{-1}$ far-infrared region. The spectra were obtained with a Bomem DA3.002 spectrometer at a resolution of $0.008 cm^{-1}$ which was chosen to match approximately the expected dimer pressure broadening for the sample pressures used (5-8 torr). In addition to the very strong pure rotational lines of the HC1 monomer, rather weak but very extensive and congested spectral features were observed over almost the entire region studied; most if not all of these features are probably due to $(HC_{1})_{2}$. So far, we have tentatively assigned a band with an origin near $150 cm^{-1}$ that appears to be the torsional fundamental of the dimer. It is analogous to the HF dimer band recently reported by von
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