DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2001 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MO: Molekülphysik

MO 9: Photoionisation I (joint session A and MO)

MO 9.2: Vortrag

Donnerstag, 5. April 2001, 16:00–16:15, H1012

Measurement of the First Ionization Potential of Actinium by Resonance Ionization Mass Spectrometry (RIMS) — •P. Kunz2, A. Waldek1, N. Erdmann1, C. Grüning1, G. Huber2, J.V. Kratz1, J. Lassen2, G. Passler2, N. Trautmann1, and K. Wendt21Institut für Kernchemie, Universität Mainz, Fritz-Strassmann-Weg 2, 55128 Mainz — 2Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz

Due to radioactivity hazard and readioactive decay only small samples of actinides can be used for spectroscopic investigations. We present a continuation of a systematic determination of the first ionization potential (IP) of actinides using samples of < 1012 atoms. With a modified RIMS method based on 3-step laser ionization in presence of a variable electric field the IP can be determined for the limit of a vanishing field. Recently the IP of the actinides up to einsteinium have been determined with this method by our group except for actinium and protactinium. For the measurement of actinium a stable atomic beam was produced from an electrolytically deposited Ac-hydroxide sample. For efficient atomization this sample was covered with Zr as a reducing agent. The ionization signals have been extrapolated to the vanishing field which is the accurate value of the IP by correcting for a fixed stray electric field in the experimental setup. In this way the IP of actinium has been measured for the first time .


This document was translated from LATEX by HEVEA.
100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2001 > Berlin