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Method and Detector to Identify Chemical Elements with Bright-Field Scanning Transmission Electron Microscopy

IP.com Disclosure Number: IPCOM000033282D
Original Publication Date: 2004-Dec-03
Included in the Prior Art Database: 2004-Dec-03

Publishing Venue

National Institute of Standards and Technology

Related People

Inventors:
Zachary H. Levine

Abstract

A multi-channel annular detector is proposed for bright-field imaging in the scanning transmission electron microscope. The detector consists of a plurality of nested annular arcs (approximately 90°120° each). Tens to hundreds of channels are envisioned. Too few, and the method described below will not work; too many and the method will not be superior to the existing charge-couple device (CCD) detectors. The sample is restricted to a partially amorphous material, or incoherent operation must be obtained. Maps of classes of chemical elements may be obtained by performing tomographic reconstructions of a particular transform of the radial distribution function of the electrons passing through the sample. Keywords: STEM; Scanning transmission electron microscopy; bright-field imaging; multi-channel detection; annular detector; tomography; chemical element identification °