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We report on magnetic resonance studies of high-density atomic hydrogen and deuterium in solid hydrogen matrices at temperatures below 1 K. Average concentrations of H atoms 310(19)cm(-3) are obtained in chemical tunneling reactions of isotope exchange with D atoms. The products of these reactions are closely located pairs of H atoms near D2 molecules with strong exchange interactions. We discovered a dynamic nuclear polarization effect on H atoms created by pumping the center of the H electron spin resonance spectrum, similar to the Overhauser effect in metals. Our results indicate that H atoms may be arranged inside molecular matrices at separations equivalent to local concentrations of 2.610(21)cm(-3). This opens up a way to build a metallic state of atomic hydrogen at zero pressure.
author list (cited authors)
Sheludiakov, S., Ahokas, J., Jrvinen, J., Zvezdov, D., Vainio, O., Lehtonen, L., ... Lee, D. M.