Regensburg 2004 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
O: Oberflächenphysik
O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)
O 28.31: Poster
Wednesday, March 10, 2004, 16:00–19:00, Bereich C
VUV photon detector with improved resolution for inverse photoemission — •R. Stiepel, R. Ostendorf, C. Benesch, H. Merz, and H. Zacharias — Physikalisches Institut, Universität Münster, D-48149 Münster, Germany
We have significantly improved the energy resolution of a VUV isochromat spectrometer for inverse photoemission. The detector used is a Geiger-Müller counter with acetone as filling gas and a CaF2 entrance window. With this detector we achieve an optical energy resolution of 330 meV (FWHM) at a mean energy of 9.9 eV for the optical bandpass. With an additional gas absorption filter arranged between two CaF2 windows at the entrance of the counting tube we enhance the resolution to 90 meV (FWHM) at a slightly decreased mean energy of 9.8 eV. The higher resolution decreases the counting rate to approximately 20%, but by filling or evacuating the gas chamber we can switch between the two modes high resolution and high counting rate within seconds.