# HIGH RESOLUTION SPECTRUM OF THE HC1 DIMER

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 Title: HIGH RESOLUTION SPECTRUM OF THE HC1 DIMER Creators: Ohashi, N.; Pine, A. S. Issue Date: 1984 Publisher: Ohio State University Abstract: Rotational structure in the spectrum of the H-C1 stretching bands of the HC1 dimer has been fully resolved using a tunable difference-frequency laser. The spectrum of a natural isotopic sample was recorded under thermal equilibrium conditions near the condensation point $(T\sim 130 K)$ of HC1 at low pressures (3-4 Torr) and long pathlengths (64-80 m). Rotational assignments have been made for $K^{\prime\prime}=0, 1$, and 2 subbands of a perpendicular-type band centered near $2880 cm^{-1}$ and a parallel-type band near $2857 cm^{-1}$ sharing a common vibrational ground state. For the ground state of the $H^{35}C1-H^{35}C1$ dimer, the $K^{\prime\prime}=0$ rotational constant, $\bar{B}= 1944.29(7) MHz$, and the $K^{\prime\prime}= 1$ asymmetry splitting, $B-C=19.5(3) MHz$, yield a zero-point center-of-mass separation of the two monomer constitutents of $3.797 (1) {\AA}$. Another difference band for the $^{35}C1$ isotope has also been observed as well as a similar set of bands for the mixed $H^{35}C1-H^{37} C1$ species. The spectra suggest an extremely rapid tunneling motion between equivalent forms of nearly orthogonally oriented monomer units. Description: Author Institution: Molecular Spectroscopy Division, National Bureau of Standards URI: http://hdl.handle.net/1811/16692 Other Identifiers: 1984-RB-2