Marten denBoer

HUNTER COLLEGE OF THE CITY UNIVERSITY OF NEW YORK	Department of Physics and Astronomy
- FACULTY -
MARTEN DENBOER PROFESSOR OF PHYSICS	OFFICE ROOM 1237A / 212 772 5258 LAB ROOM 1231 / 212 772 5448 E-MAIL Marten.denboer@hunter.cuny.edu
EDUCATION	B.A., Physics and Mathematics, Calvin College, 1972 M.S., Physics, University of Maryland, 1975 Ph.D., Physics, University of Maryland, 1979
COURSES TAUGHT	Astronomy 100
RESEARCH INTERESTS	SPECTROSCOPY AND MATERIALS SCIENCE

We use spectroscopic techniques, primarily synchrotron-based photoemission and x-ray absorption spectroscopy at the NSLS at Brookhaven National Laboratory, to study fundamental and applied problems in condensed matter physics and materials science. Electronic correlations have become a crucial factor in the understanding of important condensed matter systems such as high temperature superconductors and low dimensional materials. An illuminating arena for the study of correlations are the vanadium oxides, which exhibit a rich spectrum of behavior, including temperature dependent metal-insulator transitions, in which correlations play an important role. In conjunction with Prof. Siegfried Horn at Augsburg University in Germany we study the vanadium oxides using photoemission and x-ray absorption, which reveal information about the occupied and unoccupied states. By making such measurements as a function of temperature on oriented single crystals, we obtain detailed information about the character of the electronic states and their role in phase transitions.

During a recent photoemission measurement at the NSLS. >

Another important area of activity involves energy storage systems for portable electronics and electric vehicles. In conjunction with Prof. Steve Greenbaum of this department, we use both synchrotron-based x-ray spectroscopic techniques and NMR and EPR to evaluate materials considered for lithium batteries. An primary focus is the local atomic arrangements and electronic band structure of lithium - transition metal oxide insertion compounds being developed for battery cathodes.

< Students Svilen Kostov and YiFeng Wang during a recent x-ray measurement at the NSLS.

REPRESENTATIVE RECENT PUBLICATIONS

Extended X-ray Absorption Fine structure and Related Techniques. M. L. den Boer, T. L. Einstein, and J. J. Rehr, Encyclopedia of Advanced Materials, Bavid Bloor, Richard J. Brook, Merton C. Flemings, and Subhash Mahajan, editors, Pergamon Press, New York, 1994.

Lithium-7 NMR Studies of Li_1-xCoO₂ Battery Cathodes. B. Ouyang, X. Cao, H. W. Lin, S. Slane, S. Kostov, M. L. denBoer, and S. G. Greenbaum, Mat. Res. Soc. Symp. Proc. 369, 73 (1995).

Angular-dependent Soft X-ray Absorption Spectroscopy of V₂O₅ and V₆O₁₃. E. Goering, O. Müller, M. Klemm, J. P. Urbach, H. Petersen, C. Jung, M. L. denBoer, and S. Horn, Physica B 208 & 209, 300 (1995).

Angle Dependent Soft X-ray Absorption Spectroscopy of V₂O₅. E. Goering, O. Müller, M. Klemm, M. L. denBoer, and S. Horn, Phil. Mag. B 75, 229 (1997).

X-ray Absorption and Magnetic Resonance Spectroscopic Studies of Li_xV₆O₁₃. P. E. Stallworth, S. Kostov, M. L. denBoer, S. G. Greenbaum and C. Lampe-Onnerud, J. App. Phys. 83, 1247 (1998).

LEED and Photoemission Study of the Stability of VO₂ Surfaces. E. Goering, M. Schramme, O. Müller, R. Barth, H. Paulin, M. Klemm, M. L. denBoer, and S. Horn, Phys. Rev. B. 55, 4225 (1997).

Metal-Insulator Transition of VO₂: a XANES Investigation of the O K Edge of VO₂. O. Müller, E. Goering, J. P. Urbach, T. Weber, H. Paulin, M. Klemm, M. L. denBoer, and S. Horn, J. de Phys. 7, C2-533 (1997).

Spectroscopy of Metallic and Insulating V₂O₃. O. Müller, J. P. Urbach, E. Goering, T. Weber, R. Barth, H. Schuler, M. Klemm, S. Horn, and M. L. denBoer, Phys. Rev. B 56, 15 056 (1997).

Publication List

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Updated 1998 February

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