Abstract
The infrared spectrum of solid and liquid hydrogen was recorded using a Fourier spectrometer. The pure rotational U transitions, U 0(0) in solid para hydrogen and U 0(1) in solid normal hydrogen, with the accompanying phonon branches were observed for the first time. In addition, the rotational double transitions S 0(0) + S 0(1) and S 0(1) + S 0(1) were identified. The identifications of these transitions are based on positions calculated by making use of gas phase molecular constants. In the liquid the double transitions are preserved but the single transitions U 0(0) and U 0(1) are entirely absent. The region of Q 1←0( J) reveals structure which has not been reported before. Its interpretation is presented.
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