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Microscope

The scheme of the experimental chamber is the following:



Focusing optics

Electron analyzer

Sample holder on scanning stage



Nanospot for microscopy

The measurement station hosts a microscope which is based on a Schwarzschild Objective. Such a device consists of two spherical mirrors which demagnify the beamline focus to a submicron spot onto the sample. High reflectivity of the Schwarzschild Objective is obtained by using periodic multilayer coating. Two objectives are available which operate at photon energies of 27eV and 74eV. The smallest achievable spot size is currently 0.5 µm FWHM.

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Photoemission detection

The photoelectrons emitted from the sample are detected by angle-resolved hemispherical electron analyser installed on two-axis goniometer.


Mean radius: 40 mm
Working distance: 15 mm
Entrance slit: 0.5 x 8 mm2
Energy resolution: 12.5 meV
Energy‐dispersive multichannel detection for spectroimaging
Acceptance angle: 8 degrees
Angular modes of operation:
WA or wide angle, full angle with no angular resolution, high count rates
AP or angle to point dispersive modes with 1 mm/degree, 1.5 mm/degree, 2 mm/degree dispersions

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Sample scanning

Scanning stage with three linear axes and rotation around vertical axis
Travel range: 25x25x15 mm
Precision: 100 nm in close loop operation
Accelerations: up to 5 mm sec-2 (20 msec per 500 nm step, 28 msec per 1 μm step)
Ultimate speeds: up to 280 µm sec-1
The sample can be cooled down via copper braid attached to the flow cryostat down to 20 K and warmed up to 450 K.

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Last Updated on Tuesday, 06 December 2011 16:10