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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 247070.0, Fritz-Haber-Institut / Physical Chemistry
A high-pressure scanning tunneling microscope for studying heterogeneous catalysis
Authors:Rößler, Mario; Geng, Peter; Wintterlin, Joost
Date of Publication (YYYY-MM-DD):2005-01-11
Title of Journal:Review of Scientific Instruments
Journal Abbrev.:Rev. Sci. Instrum.
Issue / Number:02
Start Page:023705–1
End Page:023705–7
Copyright:© 2005 American Institute of Physics
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We describe an experimental setup for studying gas adsorption and chemical surface reactions by scanning tunneling microscopy (STM) at gas pressures ranging from ultrahigh vacuum (UHV) to 1 bar. The apparatus is designed for experiments to bridge the so-called pressure gap in catalysis research by obtaining atomic scale information about catalytic reaction mechanisms under steady-state conditions. It combines a UHV chamber for sample preparation and post-reaction surface analysis with a small high-pressure cell (volume 1.5 l) which contains the STM. Several concepts to improve the variable-pressure performance of existing high-pressure STM designs are described. These include access to the entire pressure range between UHV and 1 bar without triggering gas discharges, the potential for high-speed scanning and for variable temperature measurements. The design also features a fast transfer mechanism from the reactor to UHV, thus allowing for fast analysis of surface species after high-pressure experiments. First results with atomic resolution were obtained on a Ru(0001) surface at high oxygen pressures. The images show an O(1x1) adsorbate layer not observed in UHV experiments at room temperature.
Free Keywords:ruthenium; adsorbed layers; scanning tunnelling microscopy; vacuum techniques; high-pressure techniques; sample holders; catalysis; adsorption; surface chemistry
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Wintterlin J, Ludwig-Maximilians-Univ. München, Dept. Chemie, D-81377 München, Germany
Identifiers:URL:http://scitation.aip.org/getabs/servlet/GetabsServ... [Abstract]
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