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The ' Rb-' 'Xe spin-exchange cross section has been measured in N2 buffered cells as a function of the N, density using an alkali vapor magnetometer technique. The strong dependence of the spin-exchange cross section on the N2 density indicates a significant role for the Rb-Xe van der. Waals molecule in the spinexchange process. Our data have allowed us to estimate the Rb-Xe molecular formation rate, which is in reasonable agreement with previous measurements. The extrapolated binary spin-exchange cross-section term is found to be cr, "V' = 1.5)&10 ' cm'sec '.

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Estimates of the Rb-131 Xe spin-exchange cross section have been obtained by observing the nuclear spin relaxation of 131 Xe in the presence of a Rb vapor. Nuclear spin relaxation of 131 Xe due to the presence of a foreign buffer gas and the relaxation rate on the glass walls of the cell have also been observed.

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