Overlap parameters of D₂-D₂ molecular pairs from collision-induced infrared absorption

Penney, R. J. (1980) Overlap parameters of D₂-D₂ molecular pairs from collision-induced infrared absorption. Masters thesis, Memorial University of Newfoundland.

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Abstract

The collision-induced absorption of the fundamental band of D₂ in the pure gas at 77, 196, and 298 K was recorded for a number of gas densities up to 60 amagat with two 2 m absorption cells. Binary and ternary absorption coefficients of the band have been derived from the measured integrated absorption coefficients. An analysis of the absorption profiles has been performed by assuming appropriate line shapes, and the characteristic half-width parameters δd and δc of the short-range overlap-induced transitions and δq of the long-range quadrupole-induced transitions have been derived. This analysis also made it possible to separate the contributions of these two types of transitions to the total intensity of the band. For the D₂-D₂ collision pairs, the overlap parameters λ and ρ, which represent the magnitude and range, respectively, of the induced dipole moment, and μoverlap (σ), the overlap-induced dipole moment at the Lennard-Jones intermolecular diameter have been determined. These parameters are compared with those of H₂-H₂ and HD-HD, reported earlier from this laboratory [S.P. Reddy, G. Varghese, and R.D.G. Prasad, Phys. Rev. A 15, 975 (1975); S.P. Reddy and R.D.G. Prasad, J. Chem. Phys. 66, 5259 (1977)].

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