Nature of the bound states of molecular hydrogen in carbon nanohorns

Details Nature of the bound states of molecular hydrogen in carbon nanohorns Nature of the bound states of molecular hydrogen in carbon nanohorns

2007-06-04

arxiv.org/abs/0706.0428v1

Physical Review Letters 98, 21 (25/05/2007) 215503

Physics

Condensed Matter

Materials Science

4 pages

Scientific paper

10.1103/PhysRevLett.98.215503

The effects of confining molecular hydrogen within carbon nanohorns are studied via high-resolution quasielastic and inelastic neutron spectroscopies. Both sets of data are remarkably different from those obtained in bulk samples in the liquid and crystalline states. At temperatures where bulk hydrogen is liquid, the spectra of the confined sample show an elastic component indicating a significant proportion of immobile molecules as well as distinctly narrower quasielastic line widths and a strong distortion of the line shape of the para - ortho rotational transition. The results show that hydrogen interacts far more strongly with such carbonous structures than it does to carbon nanotubes, suggesting that nanohorns and related nanostructures may offer significantly better prospects as lightweight media for hydrogen storage applications.

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