Ultra-High Vacuum Compatible Optical Chopper System for Synchrotron X-ray Scanning Tunneling Microscopy

被引：3
|
作者：
Chang, Hao [1 ,2 ]
Cummings, Marvin [1 ]
Shirato, Nozomi [1 ]
Stripe, Benjamin [1 ]
Rosenmann, Daniel [3 ]
Preissner, Curt [1 ]
Freeland, John W. [1 ]
Kersell, Heath [2 ,3 ]
Hla, Saw-Wai [2 ,3 ]
Rose, Volker [1 ,3 ]
机构：
[1] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA
[2] Ohio Univ, Dept Phys & Astron, Nanoscale & Quantum Phenomena Inst, Athens, OH 45701 USA
[3] Argonne Natl Lab, Ctr Nanoscale Mat, 9700 S Cass Ave, Argonne, IL 60439 USA
来源：
XRM 2014: PROCEEDINGS OF THE 12TH INTERNATIONAL CONFERENCE ON X-RAY MICROSCOPY | 2016年 / 1696卷
关键词：
RADIATION;
D O I：
10.1063/1.4937495
中图分类号：
TH742 [显微镜];
学科分类号：
摘要：
High-speed beam choppers are a crucial part of time-resolved x-ray studies as well as a necessary component to enable elemental contrast in synchrotron x-ray scanning tunneling microscopy (SX-STM). However, many chopper systems are not capable of operation in vacuum, which restricts their application to x-ray studies with high photon energies, where air absorption does not present a significant problem. To overcome this limitation, we present a fully ultra-high vacuum (UHV) compatible chopper system capable of operating at variable chopping frequencies up to 4 kHz. The lightweight aluminum chopper disk is coated with Ti and Au films to provide the required beam attenuation for soft and hard x-rays with photon energies up to about 12 keV. The chopper is used for lock-in detection of x-ray enhanced signals in SX-STM.
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页数：4
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