A novel high-current, high-resolution, low-kinetic-energy electron source for inverse photoemission spectroscopy

Review of Scientific Instruments, vol. 94

Abstract

A high-current electron source for inverse photoemission spectroscopy is described. The source comprises a thermal cathode electron emission system, an electrostatic deflector-monochromator, and a lens system for variable kinetic energy (1.6-20 eV) at the target. When scaled to the energy resolution, the electron current is an order of magnitude higher than that of previously described electron sources developed in the context of electron energy loss spectroscopy. Surprisingly, the experimentally measured energy resolution turned out to be significantly better than calculated by standard programs, which include the electron-electron repulsion in the continuum approximation. The achieved currents are also significantly higher than predicted. We attribute this "inverse Boersch-effect" to a mechanism of velocity selection in the forward direction by binary electron-electron collisions.

Authors 6

1. H. Ibach

   Forschungszentrum Jülich

   Affiliation as printed

   Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich 1 , 52425 Jülich, Germany

2. Haruki Sato

   Chiba University

   Affiliation as printed

   Graduate School of Science and Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

3. Mihiro Kubo

   Chiba University

   Affiliation as printed

   Graduate School of Science and Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

4. Frank Stefan Tautz Aachen Experimentalphysik IV A

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   Experimentalphysik IV A, RWTH Aachen University 5 , Otto-Blumenthal-Strasse, 52074 Aachen, Germany

   Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology 4 , 52425 Jülich, Germany

   Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich 3 , 52425 Jülich, Germany

   Experimentalphysik IV A, RWTH Aachen University, Otto-Blumenthal-Strasse, 52074 Aachen, Germany

5. Hiroyuki K. Yoshida

   Chiba University

   Affiliation as printed

   Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

   Graduate School of Science and Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

   Molecular Chirality Research Center, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

6. François C. Bocquet

   Forschungszentrum Jülich · Jülich Aachen Research Alliance

   Affiliation as printed

   Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology 4 , 52425 Jülich, Germany

   Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich 3 , 52425 Jülich, Germany