Magnetic resonance studies of atomic hydrogen at zero field and low temperature: Recombination and binding on liquid helium

Magnetic resonance studies at zero field are reported for atomic hydrogen gas confined in a closed glass bulb with helium-coated walls for T < 1 K in a dilution refrigerator. Low-energy r.f. discharge pulses have been used to produce H atoms at temperatures as low as T = 0.06 K. The atom density nH (109