RESONANCEPHOTOELECTRON SPECTROSCOPY FROM AUTOIONIZATION STATES OF $CH_{3}$ l

Abstract

Autoionizing Rydberg states, n = 5 - 12, converging to the ${^{2}}E_{1/2}$ (v = 0) and ${^{2}}E_{1/2}$ ($v_{2}$ = 1) states of methyl iodide ($CH_{3}$ I) have been identified. Photoelectron spectra resulting from these Rydberg states have been taken by exciting the autoionizing states with vacuum U.V. radiation dispersed by a 1 meter normal incidence spectrometer, and measuring the kinetic energy of the ejected electrons by a time-of-flight technique. The distribution in electron energies gives directly the final ionic states resulting from a particular autoionization state. Because the discrete autoionizing states are closely spaced, the spectra must be interpreted in terms of many discrete states and many continua. The distribution of the final states ${^{2}}$ $E_{3/2}$ (v = 0) and ${^{2}}$ $E_{3/2}$ ($v_{2}$ = 1) is explained in terms of Bardsley ‘$s^{1}$ formulation of the configuration interaction theory of autoionization.