التفاصيل البيبلوغرافية
| العنوان: |
Quantum efficiency, photoemission energy spectra, and mean transverse energy of ultrananocrystalline diamond photocathode. |
| المؤلفون: |
Kachwala, A., Chubenko, O., Kim, D., Simakov, E. I., Karkare, S. |
| المصدر: |
Journal of Applied Physics; 12/14/2022, Vol. 132 Issue 22, p1-8, 8p |
| مصطلحات موضوعية: |
QUANTUM efficiency, PHOTOCATHODES, PHOTOEMISSION, ELECTRON emission, SPECTRAL sensitivity, ELECTRON scattering, ELECTRON microscopes |
| مستخلص: |
The quantum efficiency and mean transverse energy of electrons emitted from a cathode determine the quality of beams generated from photoinjectors. The nitrogen-incorporated ultrananocrystalline diamond, (N)UNCD, is a new class of robust semiconductor photocathodes, which has been considered in photoinjectors for high peak current extraction. In this work, we measure the spectral response in quantum efficiency, photoemission energy spectra, and mean transverse energy of the (N)UNCD photocathode using a photoemission electron microscope. The observed quantum efficiency was comparable to that of copper photocathodes. Photoemission spectra showed the evidence of scattering of electrons before emission. This relaxation of electrons due to scattering is also observed in the spectral response of the mean transverse energy. The mean transverse energy is limited to ∼ 70 meV at the threshold. We attribute this to the physical and chemical roughness of the (N)UNCD photocathode and, hence, smoother films will be required to further reduce the mean transverse energy obtained from the (N)UNCD photocathode. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Find this article in full text from Scitation.