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

Tobias Leopold ; Johan Rohlén ; P. Andersson ; C. Diehl ; M. Eklund ; O. Forstner ; Dag Hanstorp ; Hannes Hultgren ; P. Klason ; Anton Lindahl ; K. Wendt
International Journal of Mass Spectrometry (1387-3806). Vol. 359 (2014), p. 12-18.
[Artikel, refereegranskad vetenskaplig]

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 photodetachrnent 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) x 10(-18) cm(2), while an upper limit of 2 x 10(-2) cm(2) 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 Hf-182 should be feasible. (C) 2013 Elsevier B.V. All rights reserved.

Nyckelord: Negative ions, Photodetachment, Isobar suppression, Accelerator mass spectrometry, Absolute cross, NEGATIVE-IONS, HF-182, LASERS, COOLER



Denna post skapades 2014-04-10. Senast ändrad 2016-10-27.
CPL Pubid: 196561

 

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Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)

Ämnesområden

Fysik
Atom- och molekylfysik och optik
Molekylfysik

Chalmers infrastruktur