Imperial College London
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ProfessorXiaodongZhang

Faculty of Medicine, Department of Infectious Disease

Professor of Macromolecular Structure and Function
 
 
 
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Contact

 

+44 (0)20 7594 3151xiaodong.zhang Website

 
 
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Assistant

 

Miss Kelly Butler +44 (0)20 7594 2763

 
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Location

 

104Sir Alexander Fleming BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Maser:1995,
author = {Maser, JM and Chapman, HN and Jacobsen, CJ and Kalinovsky, A and Kirz, J and Osanna, A and Spector, S and Wang, S and Winn, B and Wirick, S and Zhang, X},
pages = {78--89},
title = {Scanning transmission x-ray microscope at the NSLS: from XANES to cryo},
year = {1995}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - The Stony Brook scanning transmission x-ray microscope (STXM) has been operating at the X1A beamline at the NSLS since 1989. A large number of users have used it to study biological and material science samples. We report on changes that have been performed in the past year, and present recent results. To stabilize the position of the micro probe when doing spectral scans at high spatial resolution, we have constructed a piezo-driven flexure stage which carries out the focusing motion of the zone plate needed when changing the wavelength. To overcome our detector limitation set by saturation of our gas-flow counter at count rates around 1 MHz, we are installing an avalanche photo diode with an active quenching circuit which we expect to respond linearly to count rates in excess of 10 MHz. We have improved the enclosure for STXM to improve the stability of the Helium atmosphere while taking data. This reduces fluctuations of beam absorption and, therefore, noise in the image. A fast shutter has been installed in the beam line. We are also developing a cryo- STXM which is designed for imaging frozen hydrated samples at temperatures below 120 K. At low temperatures, radiation sensitive samples can tolerate a considerably higher radiation dose than at room temperature. This should improve the resolution obtainable from biological samples and should make recording of multiple images of the same sample area possible while minimizing the effects of radiation damage. This should enable us to perform elemental and chemical mapping at high resolution, and to record the large number of views needed for 3D reconstruction of the object.
AU  - Maser,JM
AU  - Chapman,HN
AU  - Jacobsen,CJ
AU  - Kalinovsky,A
AU  - Kirz,J
AU  - Osanna,A
AU  - Spector,S
AU  - Wang,S
AU  - Winn,B
AU  - Wirick,S
AU  - Zhang,X
EP  - 89
PY  - 1995///
SN  - 0277-786X
SP  - 78
TI  - Scanning transmission x-ray microscope at the NSLS: from XANES to cryo
ER  -
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