Resonances in the Angular Distribution of Xenon Photoelectrons

Abstract

Measurements are reported of the resonant structure, caused by autoionization, in the angular distribution of xenon photoelectrons. The measurements were made within the autoionizing structure lying between the ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ and ${}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ ionization thresholds for the wavelength range 956 to 1015 Å. The results show a periodic variation in the asymmetry parameter $\beta$ with maximum excursions of about + 0.9 to - 0.9. The overall variation and magnitude of $\beta$ is in accord with the recent theoretical predictions of Dill.