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THE 2-10 $\mu m$ SPECTRUM OF HYDROGEN IN THE CONDENSED PHASE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/11733

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Title: THE 2-10 $\mu m$ SPECTRUM OF HYDROGEN IN THE CONDENSED PHASE
Creators: Balasubramanian, T. K.; Lien, Chen-Hsin; Gaines, James R.; Rao, K. Narahari; Nordstrom, R. J.; Damon, E. K.
Issue Date: 1981
Abstract: Continuing previous $studies^{1}$, the infrared spectra Of solid and liquid hydrogen in the region 2-10 $\mu m$ have been recorded using a $0.04 cm^{-1}$ Fourier transform spectrometer. The pure rotational U transitions, the sharp $U_{0}(0)$ in solid parahydrogen and the broad $U_{0} (1)$ in the ortho component of solid normal hydrogen together with the corresponding phonon branches have been observed for the first time. A satellite structure consisting of five components besides the main line accompanies the $U_{0}(0)$ line and occurs in the presence of 1-2 % ortho impurity. This structure has been unambiguously accounted for by invoking the electric quadrupole-quadrupole interaction between the J = 4 excited level of a paramolecule and the J = 1 level of the neighboring ortho impurity. From the measured intensity $U_{0}(0)$ an experimental value of 0.335 (in atomic units) for the hexadecapole moment of the hydrogen molecule baa been derived. In addition the pure rotational double transitions $S_{0}(0) + S_{0}(1)$ and $S_{0}(1) + S_{0}(1)$ have been identified. In the liquid spectrum the double transitions are preserved but the single transitions and the phonon branches are absent. The region of the fundamental $Q_{1}\leftarrow_{0}(J)$ reveals several weak components not reported before but which we have been able to assign based on the theory developed by Sears and Van $Kranendonk.^{2}$
URI: http://hdl.handle.net/1811/11733
Other Identifiers: 1981-WE-9
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