Photoemission study of Cs–NF3 activated GaAs(100) negative electron affinity photocathodes
Photoemission study of Cs–NF3 activated GaAs(100) negative electron affinity photocathodes
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DOI：
10.1063/1.2945276
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发表时间：
2008-06
影响因子：
4
通讯作者：
Zhi Liu;Yun Sun;Samuel P. A. Peterson;P. Pianetta
中科院分区：
文献类型：
--
作者：
Zhi Liu;Yun Sun;Samuel P. A. Peterson;P. Pianetta
GaAs based negative electron affinity photocathodes activated with Cs and NF{sub 3} are used as polarized electron sources for linear accelerators. It is generally believed that the activation layer consists of CsF. The activation layers of Cs-NF{sub 3} on GaAs photocathodes are herein investigated using synchrotron radiation photoelectron spectroscopy (SR-PES). F1s, N1s and other core levels are recorded at photon energies ranging from 70eV to 820eV. Surprisingly, a significant amount of nitrogen is observed in the activation layers. Two distinct species of nitrogen are observed, one of which decreases along with the Fluorine signal as the yield of the photocathode decays with time.
