We report high-resolution infrared absorption spectroscopic studies of the dopant-induced <$E Q sub 1 (0)> vibron band in solid parahydrogen crystals doped with low concentrations of rare gas atoms. The frequency, lineshape, and integrated absorption coefficient for the rare gas atom-induced <$E Q sub 1 (0)> vibron band are measured for Ne, Ar, Kr, and Xe. The observed lineshapes and peak maxima frequencies are sensitive to the H2 vibrational dependence of the dopant-H2 isotropic intermolecular potential. Trends observed for Ar, Kr and Xe indicate the vibrational dependence is strong enough for Xe to trap the infrared-active vibron in its first solvation shell while for Ar the vibron remains delocalized. The Ne-induced feature displays a qualitatively different lineshape which is attributed to the weak intramolecular vibrational dependence of the Ne - H2 intermolecular potential relative to the H2 - H2 interaction. The lineshapes of the Ar, Kr, and Xe dopant-induced <$E Q sub 1 (0)> pure vibrational features agree well with recent first principles calculations.

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