Feasibility of photodetachment isobar suppression of WF5- with respect to HfF5-

Autor(en)

T. Leopold, J. Rohlen, P. Andersson, C. Diehl, M. Eklund, O. Forstner, D. Hanstorp, H. Hultgren, P. Klason, A. O. Lindahl, K. Wendt

Abstrakt

The feasibility of using laser photodetachment as a means for isobar

suppression in accelerator mass spectrometry has been investigated for

the special case of HfF5−/WF5−.

A method for absolute photodetachment cross section measurements was

applied and the cross sections of tungsten pentafluoride and hafnium

pentafluoride negative ions were measured. The measurements indicate

that the photodetachment cross section for WF5− is at least 100 times larger than for HfF5− at the wavelength of the fourth harmonic of the Nd:YAG laser at 266 nm. The absolute cross section for WF5− at this photon energy was found to be (2.8 ± 0.3) × 10⁻¹⁸ cm², while an upper limit of 2 × 10⁻²⁰ cm² was obtained for the HfF5−

cross section. The measured cross sections indicate that an optical

filtering scheme for isobar suppression in accelerator mass spectrometry

for the case of Hf182 should be feasible.

Organisation(en)

Isotopenphysik

Externe Organisation(en)

Johannes Gutenberg-Universität Mainz, Universität Wien, Albert-Ludwigs-Universität Freiburg, University of Gothenburg

Journal

International Journal of Mass Spectrometry

Band

359

Seiten

12-18

Anzahl der Seiten

7

ISSN

1387-3806

DOI

https://doi.org/10.1016/j.ijms.2013.12.010

Publikationsdatum

02-2014

Peer-reviewed

Ja

ÖFOS 2012

103014 Kernphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Instrumentation, Spectroscopy, Physical and Theoretical Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/39363bbc-7ef3-42db-af2f-dc3972e4f0a7