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A theoretical analysis is presented of the relaxation processes which lead to the magnetization of gaseous hydrogen atoms in a strong magnetic field. Experiments are described which demonstrate that the spin-lattice relaxation time in a pure H 2 carrier can be of the order of 10 ms. From the effects of traces of O 2 on the hydrogen atom EPR spectrum, a H-O 2 spin-exchange collision cross section of (8.0 ± 2.5) × 10 -16 cm 2 was derived.

Spin-relaxation effects on the EPR spectrum of gaseous hydrogen atoms