Sketch of the hp detection cell in the high field region of the superconducting magnet. Prior to experiments, the cell was evacuated to a pressure of less than . The hp mixture was then transferred from the pump cell by pressure equalization. The gas flow was controlled by two pneumatically actuated values located in the fringe field of the superconducting magnet.
Representative signal intensity decay data from hp in a 50% krypton and 50% gas mixture as a function of time. The total gas density and the surface chemistry of the detection cell walls are indicated in the legend. The -axes represent the natural logarithm of the signal intensities measured from evenly spaced, medium angle rf pulses applied to single boluses of hp gas. The intensities in each curve have been normalized to the intensity resulting from the first rf pulse.
Longitudinal relaxation rates for gas mixtures with fixed compositions as a function of . The data are from gas mixtures consisting of 25% Kr and either 75% or 75% He in the untreated detection cell. The experimental uncertainties are within the spread of symbols and have been omitted for clarity.
data as a function of . The buffer gas and the surface chemistry of the detection cell are indicated in the legend. The lines are linear fits of the data with slopes of and the intercepts of (see Table I). The experimental uncertainties are within the spread of symbols and have been omitted for clarity.
Binary collision data for longitudinal relaxation.
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