Measurement of potential distribution function on object surface by using an electron microscope in the mirror operation mode

Measurement of potential distribution function on object surface by using an electron microscope in the mirror operation mode

Summary The quantitative theory of image contrast in an electron microscope in the mirror operation mode is given in this paper. This theory permits us to calculate the potential distribution on the object surface from the current density distribution on the microscope screen. The potential distribu...

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Veröffentlicht in:Journal of microscopy (Oxford) 2010-04, Vol.238 (1), p.90-94
Hauptverfasser: NEPIJKO, S.A., SCHÖNHENSE, G.
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Sprache:eng
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Contact potential difference
electron microscopy
mirror operation mode local electric field
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SCHÖNHENSE, G.
description Summary The quantitative theory of image contrast in an electron microscope in the mirror operation mode is given in this paper. This theory permits us to calculate the potential distribution on the object surface from the current density distribution on the microscope screen. The potential distribution results in image formation on the screen. Local electric fields existing on the object surface lead to a perturbation of electron trajectories above the object and to a redistribution of the current density on the screen, causing image contrast. Using the quantitative correlation between these fields and the function of current density distribution on the screen, it is possible to calculate the magnitude of these microfields as well. As illustration, a measured potential distribution on an object surface with spiral structures of adsorbates was analysed. These structures are formed during reaction of CO oxidation on Pt(110). The value of the measured contact potential difference comprised a few hundredths of volt.
doi_str_mv 10.1111/j.1365-2818.2009.03340.x
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subjects Contact potential difference
electron microscopy
mirror operation mode local electric field
title Measurement of potential distribution function on object surface by using an electron microscope in the mirror operation mode
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