The compression property of hydrogen at megabar pressures and the form of the repulsive interaction potential in hydrogen at short distances
Abstract
It is shown that the slope of the repulsive part of the interaction potential between hydrogen atoms above the dissociation limit decreases with decreasing internuclear separation. Such a form of the repulsive potential explains the reduction of the shock and quasi-isentropic compression curve slopes of hydrogen isotopes at megabar pressures obtained in recent experiments [R. F. Trunin, V. D. Urlin, and A. B. Medvedev, Phys.-Usp. 53, 577 (2010), R. I. Ilkaev, et al., AIP Conf. Proc. 706, 73 (2004)].
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