Metallic Hydrogen

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Term Paper Title	Metallic Hydrogen
# of Words	1343
# of Pages (250 words per page double spaced)	5.37

Metallic Hydrogen

Hydrogen:
the most abundant element in the universe.
Normally it has been considered to remain a
non-metal at any range of temperatures and
pressures. That is, until now. Recently this year,
hydrogen was changed into a metallic substance,
which could conduct electricity. An experiment
conducted by William J. Nellis et al. at the
Lawrence Livermore National Laboratory
accomplished this feat. Hydrogen was converted
from a non-metallic liquid, into a liquid metal. The
likelihood that the most abundant element in the
universe could be converted into metallic form at
sufficient pressures was first theorized in 19351,
but tangible evidence has eluded scientists in the
intervening decades. "Metallization of hydrogen
has been the elusive Holy Grail in high-pressure
physics for many years," said Bill Nellis, one of
three Livermore researchers involved in the
project. "This is a significant contribution to
condensed matter physics because a pressure and
temperature that actually produce metallization
have finally been discovered."2 Livermore
researchers Sam Weir, Art Mitchell, and Bill
Nellis used a two-stage gas gun at Livermore to
create enormous shock pressure on a target
containing liquid hydrogen cooled to 200 K (-
4200 F). Sam Weir, Arthur Mitchell (a Lab
associate), and Bill Nellis published the results of
their experiments in the March 11 issue of Physical
Review Letters under the title "Metallization of
Fluid Molecular Hydrogen at 140 GPa (1.4
Mbar)." When asked about the significance of the
work, Nellis had this to say: "Hydrogen makes up
90 percent of the universe. Jupiter is 90 percent
hydrogen and contains most of the mass in our
planetary system. Hydrogen is very important to a
lot of work done at the Lab. Hydrogen in the form
of deuterium and tritium isotopes is the fuel in
laser-fusion targets and how it behaves at high
temperatures and pressures is very important to
Nova and the National Ignition Facility."3 By
measuring the electrical conductivity, they found
that metallization occurs at pressure equivalent to
1.4 million times Earth's atmospheric pressure,
nine times the initial density of hydrogen, and at a
temperature of 30000 K (50000 F). Because of
the high temperature, the hydrogen was a liquid.
The intense pressure lasted less than a
microsecond. Optical evidence of a new phase of
hydrogen has been previously reported using an
experimental approach that involves crushing
microscopic-sized samples of crystalline hydrogen
be...

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