MAGNETIC RESONANCE STUDIES OF ATOMIC HYDROGEN GAS AT LOW TEMPERATURES

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Abstract
Using a pulsed low temperature discharge in a closed cell containing H2 and 4He, we have been able to store a low density (~ 1012 atoms/cc) gas of atomic hydrogen for periods of order one hour in zero magnetic field and T ≃ 1 K. Pulsed magnetic resonance at the 1420 MHz hyperfine transition has been used to study a number of the properties of the gas, including the recombination rate H + H + 4He → H2 + 4He, the hydrogen spin-exchange relaxation rates, the diffusion coefficient of H in 4He gas and the pressure shift of the hyperfine frequency due to the 4He buffer gas. Here we discuss the application of hyperfine frequency shifts as a probe of the H-He potential, and as a means for determining the binding energy of H on liquid helium

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