By using bolometric detection of ESR we have observed that of order 1% of the two-body surface recombination energy of atomic hydrogen is deposited directly into liquid helium at the sample cell walls. Most of the energy is transferred from the recombination site by highly excited H2 molecules which are found to experience at least 150 wall collisions in order to release half of their rovibrational energy.
We presenta method suitable for a real time computer analysis of ESR signals strongly distorted due to an intense paramagnetic sample. This occurs typically in experiments with high Q cavities and narrow fines car¡ out at low temperatures. We have applied this method to ESR of gaseous spin polarized atomic hydrogen. During ah experiment the density of gas atoms in a cavity may decrease a few orders of magnitude. Thus the ESR line shape evolves correspondingly from a regime of heavily distorted signals to that of undistorted ones. We have compared our analysis with independent measurements of the hydrogen density by a sensitive pressure gauge.
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