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Science 26 November 1993:
Vol. 262. no. 5138, pp. 1427 - 1429
DOI: 10.1126/science.262.5138.1427
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Articles

X-ray Linear Dichroism Microscopy

H. Ade 1 and B. Hsiao 2

1 Department of Physics, North Carolina State University, Raleigh, NC 27695-8202
2 Experimental Station, DuPont, Wilmington, DE 19880-0302

Chemical-specific x-ray linear dichroism was observed in an x-ray microscope as evidenced by changes in relative contrast upon azimuthal rotation of the sample. As a demonstration, thin sections of a partially ordered polymer fiber were examined with a transmission x-ray microscope near the carbon K-shell absorption edge to provide chemical-specific imaging at 50-nanometer spatial resolution. The observed dichroism and change in contrast upon rotation arise from the polarization dependence of the near-edge x-ray absorption cross section and can be used to image the orientation of specific chemical bonds.

Submitted on July 20, 1993
Accepted on October 6, 1993

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Science. ISSN 0036-8075 (print), 1095-9203 (online)