Photoemission study of Cs–NF3 activated GaAs(100) negative electron affinity photocathodes
作者： Zhi Liu , Yun Sun , Samuel Peterson , Piero Pianetta
DOI: 10.1063/1.2945276
关键词: Fluorine 、 Analytical chemistry 、 Particle accelerator 、 Synchrotron radiation 、 Gallium arsenide 、 Electron 、 Photocathode 、 Chemistry 、 Electron affinity 、 X-ray photoelectron spectroscopy
摘要: GaAs based negative electron affinity photocathodes activated with Cs and NF{sub 3} are used as polarized sources for linear accelerators. It is generally believed that the activation layer consists of CsF. The layers Cs-NF{sub on herein investigated using synchrotron radiation photoelectron spectroscopy (SR-PES). F1s, N1s other core levels recorded at photon energies ranging from 70eV to 820eV. Surprisingly, a significant amount nitrogen observed in layers. Two distinct species observed, one which decreases along Fluorine signal yield photocathode decays time.
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