Abstract
Although molecular hydrogen is the electronically simplest neutral molecule, it remains a popular subject of research. Molecular hydrogen is unique in that the rotational and vibrational motions remain quantized in the condensed phases. While this to vibrational structure has been well characterized in the gas phase, experimental results are lacking in the liquid and solid phases. Such a paucity of experimental evidence may explain why metallic hydrogen, although predicted over half a century ago,1 has only recently been observed in a liquid phase.1 Experimental evidence of how the molecular levels shift and broaden would prove useful in understanding how a conduction band may form.
© 1997 Optical Society of America
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