Tunable deep ultraviolet laser based near ambient pressure photoemission electron microscope for surface imaging in the millibar regime

A newly developed instrument comprising a near ambient pressure (NAP) photoemission electron microscope (PEEM) and a tunable deep ultraviolet (DUV) laser source is described. This NAP-PEEM instrument enables dynamic imaging of solid surfaces in gases at pressures up to 1 mbar. A diode laser (976 nm)...

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Bibliographic Details
Published in:Review of scientific instruments 2020-11, Vol.91 (11), p.113704-113704
Main Authors: Ning, Yanxiao, Li, Yifan, Wang, Chao, Li, Rongtan, Zhang, Fengfeng, Zhang, Shenjin, Wang, Zhimin, Yang, Feng, Zong, Nan, Peng, Qinjun, Xu, Zuyan, Wang, Xiaoyang, Li, Rukang, Breitschaft, Martin, Hagen, Sebastian, Schaff, Oliver, Fu, Qiang, Bao, Xinhe
Format: Article
Language:English
Subjects:
High vacuum
Imaging
Laser applications
Laser beam heating
Lasers
Oxidation
Photoelectric emission
Pressure
Scientific apparatus & instruments
Semiconductor lasers
Solid surfaces
Tunable lasers
Ultraviolet lasers
Work functions
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Summary:A newly developed instrument comprising a near ambient pressure (NAP) photoemission electron microscope (PEEM) and a tunable deep ultraviolet (DUV) laser source is described. This NAP-PEEM instrument enables dynamic imaging of solid surfaces in gases at pressures up to 1 mbar. A diode laser (976 nm) can illuminate a sample from the backside for in situ heating in gases up to 1200 K in minutes. The DUV laser with a tunable wavelength between 175 nm and 210 nm is perpendicularly incident onto the sample surface for PEEM imaging of a wide spectrum of solids with different surface work functions. Using this setup, we have first demonstrated spatiotemporal oscillation patterns of CO oxidation reaction on Pt(110) from high vacuum to NAPs and gas-induced restructuring of metal nanostructures in millibar gases. The new facility promises important applications in heterogeneous catalysis, electrochemical devices, and other surface processes under nearly working conditions.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0016242