ABSORPTION SPECTRA OF SOLID MOLECULAR HYDROGEN IN THE FIRST OVERTONE $REGION^{1}$

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1987

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Ohio State University

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Solid hydrogen crystals of both para and normal species were grown in a glass cell 6.4 cm long and 1.0 cm in diameter using liquid helium cryogenics apparatus. Their infrared absorption spectra were recorded in the first overtone region $8000 - 9400 cm^{-1}$. The absolute intensities of several zero phonon transitions of the type $Q_{2}(J), Q_{1}(J) + Q_{1}(J), S_{2}(J), Q_{2}(J) + S_{e}(J), Q_{1}(J) + S_{1}(J), S_{2}(J) + S_{o}(J)$ and $S_{2}(J) + S_{2}(J)$ and those of the accompanying phonon branches $Q_{R}$ and $S_{R}$ were measured. The observed spectra clearly demonstrate that there is no contribution to the intensity of the pure vertone $Q_{R}$ phonon branch from isotropic electron overlap induction mechanism. This is in striking contrast to the observations in the fundamental band of either $solid^{2}$ or $gaseous^{3}$ hydrogen.

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$^{1}$ Supported by NSERC Grant No. A-2440. $^{2}$ H. P. Gush, W. F. J. Hare, E. J. Allen and H. L. Welsh, Can. J. Phys. 38, 176 (1960). $^{3}$ S. P. Reddy, G. Varghese and R. D. G. Prasad, Phys. Rev. A 15, 975 (1977).
Author Institution: Department of Physics, Memorial University of Newfoundland; Ranchi University, Ranchi, India., Memorial University of Newfoundland

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