Wavelength Dependence of the Fano Effect

The spin polarization of photoelectrons emitted by unpolarized cesium atoms exposed to circularly polarized light has been measured at wavelengths between 2300 and 3200 Å. At certain wavelengths 100% polarization has been obtained. Slight deviations from theory have been observed. Irradiation of a broad mercury spectrum resulted in (81± 3)% polarization with a current of 0.3×${10}^{-10\mathrm{}}$ A.