The interference of a discrete autoionized state with a continuum gives rise to characteristically asymmetric peaks in excitation spectra. The earlier qualitative interpretation of this phenomenon is extended and revised. A theoretical formula is fitted to the shape of the resonance of He observed in the inelastic scattering of electrons. The fitting determines the parameters of the resonance as follows: ev, ev, . The theory is extended to the interaction of one discrete level with two or more continua and of a set of discrete levels with one continuum. The theory can also give the position and intensity shifts produced in a Rydberg series of discrete levels by interaction with a level of another configuration. The connection with the nuclear theory of resonance scattering is indicated.
- Received 14 July 1961
- Published in the issue dated December 1961
© 1961 The American Physical Society