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Likelihood of a high-pressure phase of solid hydrogen involving termolecular complexes
Journal of Physical Chemistry (1981)
  • Richard Alan Lesar, Harvard University
  • D. R. Herschbach, Harvard University
Electronic-structure calculations have shown that the six-center transition state for the concerted bond exchange among three hydrogen molecules lies -2 eV or more below the dissociation energy of the diatomic molecule. This suggests that solid hydrogen might undergo a high-pressure transition to form a new phase involving termolecular complexes. This possibility is examined by means of lattice-energy calculations employing semitheoretical pair potentials. Although uncertainties in the pair potentials prevent a definite conclusion, the results obtained for a range of potentials indicate that a phase comprising a “largely dissociated” form of the six-center transition state may be stable at pressures above a few hundred kilobars. This complex would exist only because repulsive forces from the neighboring units in the crystal environment prevent its dissociation.
Publication Date
December 1, 1981
Publisher Statement
Reprinted with permission from Journal of Physical Chemistry 5 (1981): 3787. Copyright 1981 American Chemical Society.
Citation Information
Richard Alan Lesar and D. R. Herschbach. "Likelihood of a high-pressure phase of solid hydrogen involving termolecular complexes" Journal of Physical Chemistry Vol. 85 Iss. 25 (1981)
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