Atomic Hydrogen Cleaning of Polarized GaAs Photocathodes
Instrumentation and Detectors
2017-08-23 v1
Abstract
Atomic hydrogen cleaning followed by heat cleaning at 450C was used to prepare negative-electron-affinity GaAs photocathodes. When hydrogen ions were eliminated, quantum efficiencies of 15% were obtained for bulk GaAs cathodes, higher than the results obtained using conventional 600C heat cleaning. The low-temperature cleaning technique was successfully applied to thin, strained GaAs cathodes used for producing highly polarized electrons. No depolarization was observed even when the optimum cleaning time of about 30 seconds was extended by a factor of 100.
Keywords
Cite
@article{arxiv.physics/0412098,
title = {Atomic Hydrogen Cleaning of Polarized GaAs Photocathodes},
author = {T. Maruyama and D. -A. Luh and A. Brachmann and J. E. Clendenin and E. L. Garwin and S. Harvey and R. E. Kirby and C. Y. Prescott and R. Prepost},
journal= {arXiv preprint arXiv:physics/0412098},
year = {2017}
}