| Zugriffsnummer | 13705 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Quantum efficiencies of gold and copper photocathodes in the VUV and X-ray range |
| Autor(in); Institution |
Henneken, Heike; 7.12, Röntgenradiometrie, PTB-Berlin
Scholze, Frank; 7.12, Röntgenradiometrie, PTB-Berlin
Krumrey, Michael; 7.12, Röntgenradiometrie, PTB-Berlin
Ulm, Gerhard; 7.1, Photonenradiometrie, PTB-Berlin
|
| Quelle/Jahr | Metrologia: 37 (2000), 5, 485 - 488 |
| ISSN | 0026-1394 |
| DOI | |
| Verlag | Sevres Cedex: Bureau International des Poids et Mesures |
| Konferenzangaben | NEWRAD '99, Madrid, 25-27, October, 1999, Spain |
| Zusammenfassung | The quantum efficiency, η , of gold and copper photocathodes has been measured in the photon-energy range from 50 eV to 10 keV. The experiments were performed with monochromatized synchrotron radiation at the radiometry laboratories of the Physikalisch-Technische Bundesanstalt (PTB) at the electron storage rings BESSY I and BESSY II. Relative standard uncertainties of η lower than 0.036 were achieved using a cryogenic electrical-substitution radiometer as the primary detector standard. The samples were cleaned, stored and examined in an ultra-high-vacuum chamber. The quantum efficiency of cleaned gold and copper was found to be reproducible within 2 parts in 102 to 3 parts in 102. A simple model assumes η to be propoartional to the product of absorption coefficient, μ , and photon energy, hν . The relative course of the absorption coefficient was also measured with relative standard uncertainties below 0.04. As proportionality was only locally fulfilled, a more sophisticated model for quantum efficiency was developed. |
