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Review of Scientific Instruments / Volume 73 / Issue 3 / TECHNIQUES

Rev. Sci. Instrum. 73, 1649 (2002); http://dx.doi.org/10.1063/1.1445829 (3 pages)

Requirements for x-ray magnetic circular dichroism on paramagnetic biological systems and model compounds

Tobias Funk, Stephan Friedrich, Anthony Young, Elke Arenholz, and Stephen P. Cramer

Lawrence Berkeley National Laboratory, Berkeley, California 94720

We have built an end station for x-ray magnetic circular dichroism (XMCD) measurements on proteins and paramagnetic compounds. Our current setup reaches a base temperature of 2.6 K and magnetic fields up to 6 T and is operated at beamline 4.02 of the Advanced Light Source. In this article we discuss magnetic field and low temperature requirements needed to perform XMCD experiments on magnetically saturated samples. For a typical 3d transition metal paramagnetic system we find that fields above 4 T at a temperature of 2.6 K saturate the magnetization of the sample to more than 80%. We discuss principal considerations for a setup operated at low temperatures on a synchrotron and show that infrared heat shielding is unavoidable to obtain the base temperature at the sample. We show first experimental results from the vanadium (IV) compound VOSO4X[H2O]. © 2002 American Institute of Physics.

© 2002 American Institute of Physics

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KEYWORDS and PACS

Keywords

biological techniques, proteins, molecular biophysics, macromolecules, synchrotron radiation, magnetic circular dichroism, biomagnetism, magnetisation, X-ray spectroscopy, paramagnetic materials, low-temperature techniques

PACS

  • 87.64.K-

    Spectroscopy

  • 07.85.Qe

    Synchrotron radiation instrumentation

  • 87.14.E-

    Proteins

  • 07.20.Mc

    Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1445829

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    B. T. Thole, P. Carra, F. Sette, and G. van der Laan, Phys. Rev. Lett. 68, 1943 (1992).

    P. Carra, B. T. Thole, M. Altarelli, and X. Wang, Phys. Rev. Lett. 70, 694 (1993).


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