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Strong phonon replicas in be 1s photoemission spectra
J N Andersen1, T Balasubramanian, C O Almbladh
1Department of Synchrotron Radiation Research, Institute of Physics, Lund University, P.O. Box 118, S-221 00 Lund, Sweden. Jesper.Andersen@sljus.lu.se
Physical Review Letters
|May 1, 2001
Abstract:
The Be 1s core level photoemission line from metallic Be is shown to contain unexpected internal fine structure. We argue that this fine structure is caused by intrinsic excitation of a narrow band of optical phonons in the 1s photoemission process. The general importance of the present results for high resolution core level photoemission investigations of metals is pointed out.