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µ-FOCUS 500/600 NAP

Small Spot µ-FOCUS 500/600 X-Ray Monochromator for Near Ambient Pressure Applications

The small spot monochromator µ-FOCUS 500/600 NAP is developed for XPS measurements in near ambient pressure regime. The X-ray monochromator operates according to Bragg´s Law of X-ray diffraction. A single wavelength of X-rays is reflected from a quartz single crystal mirror at a specific angle of reflection. The mirror has a 500 mm Rowland circle diameter for µ-FOCUS 500  NAP and 600 mm for µ-FOCUS 600 NAP, respectively. Due to its overall compactness, the µ-FOCUS 500/600 NAP is suitable for mounting on almost any analysis chambers as a bolt-on component. By using the differentially pumped NAP extension with Si3N4 window, XPS measurements under gas atmospheres of up to 30 mbar can be carried out.

The µ-FOCUS 500/600 NAP monchromator is equipped with microfocus high performance X-ray source XR 50 MF which is specially designed for the use with the monochromator. This small spot source is equipped with Al anode. Thus, µ-FOCUS 500/600 NAP monochromator togeher with the XR 50 MF microfocus X-ray source is perfectly suited for small spot, high resolution and high intensity XPS measurements under NAP conditions.


  • Spot size on the sample: between 200 µm and 1 mm
  • NAP extension with Si3N4 window for XPS measurements under gas atmospheres up to 30 mbar
  • Monochromatic Al Kα excitation with high energy resolution
  • High photon flux up to 1.9 x 1010 photons/s
  • Rowland circle with 500/600 mm
  • Pumping port for differential pumping




µ-FOCUS 500/600 NAP

180 W for Al anode

Maximum Anode Voltage

15 kV

Dual Anode


Working Conditions


Required Accessories

CCX 70 Isolation Unit

Differential pumping

Closed-Cycle Water Cooling System

Optional Accessories




Anode Materials Available

Al anode

Power Supply

UXC 1000 Universal X-Ray Source Control

Mounting Flange

DN100 CF

Insertion Depth


max. chamber port length for µ-FOCUS 500: 177 mm

max. chamber port length for µ-FOCUS 600: 254 mm

Rowland Cirlce Diameter

500 mm for µ-FOCUS 500 NAP

600 mm for µ-FOCUS 600 NAP

Cross Talk


Spot Size

variable spot size: 200 µm - 1 mm

Photon Flux

1.9 x 1010 photons/s




  1. (2018) <p>Electrifying model catalysts for understanding electrocatalytic reactions in liquid electrolytes</p>

    Electrocatalysis is at the heart of our future transition to a renewable energy system. Most energy storage and conversion technologies for renewables rely on electrocatalytic processes and, with increasing availability of cheap electrical energy from renewables, chemical production will witness electrification in the near future1,2,3. However, our fundamental understanding of electrocatalysis lags behind the field of classical heterogeneous catalysis that has been the dominating chemical technology for a long time. Here, we describe a new strategy to advance fundamental studies on electrocatalytic materials. We propose to ‘electrify’ complex oxide-based model catalysts made by surface science methods to explore electrocatalytic reactions in liquid electrolytes. We demonstrate the feasibility of this concept by transferring an atomically defined platinum/cobalt oxide model catalyst into the electrochemical environment while preserving its atomic surface structure. Using this approach, we explore particle size effects and identify hitherto unknown metal–support interactions that stabilize oxidized platinum at the nanoparticle interface. The metal–support interactions open a new synergistic reaction pathway that involves both metallic and oxidized platinum. Our results illustrate the potential of the concept, which makes available a systematic approach to build atomically defined model electrodes for fundamental electrocatalytic studies.

    F. Faisal, C.Stumm, M. Bertram, F. Waidhas, Y. Lykhach, S.Cherevko, F. Xiang, M. Ammon,
    M. Vorokhta, B. Šmíd, T. Skála, N. Tsud, A. Neitzel, K. Beranová, K. C. Prince, S. Geiger,
    O. Kasian, T. Wähler, R. Schuster, M. A. Schneider, V. Matolín, K. J. J.
    Nature Materials volume 17, pages 592–598 (2018)
    Read more


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