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A rich spectrum composed of hundreds of sharp features (HWHM{}20 MHz) has been observed in the fundamental Q branch of solid H₂, representing the first case of solid phase linear spectroscopy in which the high-resolution capabilities of laser spectroscopy have been fully exploited. These features are interpreted as splittings of o-H₂ pairs based on the work by Hardy, Berlinsky, and Harris.
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Chan et al. (1991) studied this question.
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