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NanoXAS Endstation

a) Schematic of the NanoXAS endstation showing the key components of the STXM and SPM.
a) Schematic of the NanoXAS endstation showing the key components of the STXM and SPM.
The NanoXAS endstation consists of a scanning transmission X-ray microscope (STXM) in combination with a scanning probe microscope (SPM). By combining these techniques, the NanoXAS is able to obtain elemental and chemical composition, oxidation states, molecular orientation, topography, surface forces, as well as electric and magnetic properties on a variety of specimens with nanoscale resolution. A Fresnel zone plate focuses the monochromatic x-rays onto a semi-transparent sample. An optical sorting aperture (OSA) filter optimizes transmission of the first diffraction order and blocks out other orders. Several detectors and detection modes can be employed depending on the type of study. The sample is scanned through the x-rays using a fine closed-loop piezo scanner (range 40 um x 40 um x 6 um).

Zone plate

The zone plates used at NanoXAS provide a balance between efficiency, focal length, and resolution. To a first approximation, the resolution of the instrument is similar to the outermost zone width of the zone plate. Two zone plates are mounted in the NanoXAS endstation with outermost zone widths of 40 nm and 30 nm, and were manufactured at PSI in the laboratory for micro and nanotechnology (LMN).

Detectors

A number of different detector types are available for enabling different experiments. Non-standard detectors are only available at the discretion of the beamline staff.
Detector Notes
Silicon Avalanche Photodiode (APD)
Silicon avalanche photodiode.zoom
Silicon avalanche photodiode.
Transmission measurements by avalanche photo diode.
Channeltron
Channeltron detector.zoom
Channeltron detector.
Surface sensitive electron detection can be performed simultaneously with x-ray transmission measurements.
Scanning Probe Tip
SPM tip.zoom
SPM tip.
Conventional detection by SPM tip.

In-situ views

Detector Notes
Realtime Camera 1 (CCD)
Camera view 1 of sample region.zoom
Camera view 1 of sample region.
Ex-situ camera for alignment of the SPM tip and coarse positioning of the sample.
Realtime Camera 2 (CCD)
Camera view 2 of sample region.zoom
Camera view 2 of sample region.
Ex-situ camera for tip-sample separation.

Other specifications

Property Notes
Pressure 10E-8 mbar
Temperature RT (or resistive heating)
Flux 1E13 ph/s @ 300 eV
FZP diameter 240 um
FZP outermost zone width 40 nm
OSA diameter 40 um
Energy range 270-1800 eV
Focal length 7748 um @ 1000 eV


Partners and Collaborators
This project is a collaboration between EMPA, PSI, and University of Erlangen-Nuremberg:
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Partners and Collaborators

This project is a collaboration between EMPA, PSI, and University of Erlangen-Nuremberg
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