Temperature Dependence of thee−Naande−RbSpin-Exchange Cross Sections

Abstract

The $e-\mathrm{R}\mathrm{b}$ and $e-\mathrm{N}\mathrm{a}$ spin-exchange cross sections have been measured in a spin-exchange optical-pumping experiment as a function of temperature over the range 300-660 °K for Rb and 400-725 °K for Na. Within experimental error, the cross sections are essentially constant as a function of temperature. Measurements at 293 °K give ${\sigma }_{\mathrm{SE}}\left(\mathrm{Rb}\right)=(7.0\mathrm{}\pm 2.0)\times {10}^{-14\mathrm{}}$ ${\mathrm{cm}}^2$ and measurements at 403 °K give ${\sigma }_{\mathrm{SE}}\left(\mathrm{Na}\right)=(3.2\mathrm{}\pm 1.0)\times {10}^{-14\mathrm{}}$ ${\mathrm{cm}}^2$.