Abstract
The first overtone vibration-rotation transition of parahydrogen in a crystal containing a residual amount of orthohydrogen has been detected using high resolution laser spectroscopy. The observed spectrum shows several splittings due to the anisotropic crystal field interactions. The crystal field splitting of a singleJ=1 orthohydrogen molecule in solid parahydrogen at liquid He temperatures is found to be 0.0070cm−1 (0.0108 K).
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