陽電子消滅励起オージェ電子分光法による表面最表層の分析

抄録

Positron-annihilation induced Auger electron spectroscopy (PASS) makes use of low-energy (∼10 eV) positron beams to create core-hole excitations through matter-antimatter annihilation. PAES has a number of advantages over conventional electron-induced Auger electron spectroscopy: 1) enhanced surface selectivity, 2) elimination of the background of secondary electrons, and 3) extremely low beam-damage. A problem of PAES experiments is a low countrate due to the extremely low beam current of positrons. A time of flight (TOF) system with use of an intense pulsed positron beam makes it possible to measure PAES spectra with higher count-rate and higher energy-resolution than previous apparatus. In the present paper, we describe the mechanism and characteristics of PAES, and then show the details of the TOF-PAES apparatus and applications with it.