Method for resurrecting negative electron affinity photocathodes after exposure to an oxidizing gas
Abstract
A method by which negative electron affinity photocathodes (201), single crystal, amorphous, or otherwise ordered, can be made to recover their quantum yield following exposure to an oxidizing gas has been discovered. Conventional recovery methods employ the use of cesium as a positive acting agent (104). In the improved recovery method, an electron beam (205), sufficiently energetic to generate a secondary electron cloud (207), is applied to the photocathode in need of recovery. The energetic beam, through the high secondary electron yield of the negative electron affinity surface (203), creates sufficient numbers of low energy electrons which act on the reduced-yield surface so as to negate the effects of absorbed oxidizing atoms thereby recovering the quantum yield to a pre-decay value.
- Inventors:
- Issue Date:
- Research Org.:
- Saxet Surface Science
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1079230
- Patent Number(s):
- 8298029
- Application Number:
- 12/931,839
- Assignee:
- DOESC
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02W - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- DOE Contract Number:
- SC0002268
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
Mulhollan, Gregory A, and Bierman, John C. Method for resurrecting negative electron affinity photocathodes after exposure to an oxidizing gas. United States: N. p., 2012.
Web.
Mulhollan, Gregory A, & Bierman, John C. Method for resurrecting negative electron affinity photocathodes after exposure to an oxidizing gas. United States.
Mulhollan, Gregory A, and Bierman, John C. Tue .
"Method for resurrecting negative electron affinity photocathodes after exposure to an oxidizing gas". United States. https://www.osti.gov/servlets/purl/1079230.
@article{osti_1079230,
title = {Method for resurrecting negative electron affinity photocathodes after exposure to an oxidizing gas},
author = {Mulhollan, Gregory A and Bierman, John C},
abstractNote = {A method by which negative electron affinity photocathodes (201), single crystal, amorphous, or otherwise ordered, can be made to recover their quantum yield following exposure to an oxidizing gas has been discovered. Conventional recovery methods employ the use of cesium as a positive acting agent (104). In the improved recovery method, an electron beam (205), sufficiently energetic to generate a secondary electron cloud (207), is applied to the photocathode in need of recovery. The energetic beam, through the high secondary electron yield of the negative electron affinity surface (203), creates sufficient numbers of low energy electrons which act on the reduced-yield surface so as to negate the effects of absorbed oxidizing atoms thereby recovering the quantum yield to a pre-decay value.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 30 00:00:00 EDT 2012},
month = {Tue Oct 30 00:00:00 EDT 2012}
}