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Ultra-high Vacuum Ф4 Kelvin Probe

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Φ4: Scanning, ambient pressure photoemission spectroscopy, surface photovoltage and surface photovoltage spectroscopy capabilities

Our Ф4 Ultra-high Vacuum Scanning Kelvin Probe system gives the user full access to work function measurements under vacuum with the ability to alter the temperature from 77 K to 860 K. The Kelvin probe measurement has resolution of 1 - 3 meV for a 2 mm tip on a conducting sample. The sample is mounted on a plate that is located on a motorized (x, y, z) translator attached to a stainless steel vacuum chamber. Phi 4 also comes with a photoemission spectroscopy system with a tunable source (3.4 - 7.0 eV). The deep ultra-violet (DUV) light spot measures approximately 3 x 4 mm. Absolute work function measurements can be obtained with this system in the range of 4.0 - 6.5 eV with an accuracy of 0.05 - 0.1 eV.

The system can be upgraded with surface photovoltage spectroscopy through utilising other ports in the system chamber. Liquid nitrogen is used as the method of cooling the sample and heating is achieved by controllable direct current. Nitrogen gas is used to displace the oxygen to facilitate the use of the photoemission system source. An optical breadboard is used to support the chamber and standard power is required for operation.

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Systems & specifications


Tip material / diameter 2 mm/4 mm/10 mm stainless steel tip
Work function resolution 1 - 3 meV
Manual translation 100 mm manual translator
Scan control Automatic via user interface (20 x 20 mm)
Sample stage UHV compatible 3-axis motorised stage
Visualisation 3D map of surface potential and sample topography
Oscilloscope Digital TFT oscilloscope for real time signal
Pump Turbo-molecular pump backed by a rotary pump
Energy range (APS / SPS) 3.4 - 7.0 eV / 1.24 - 3.10 eV
Detection system Off-null with parasitic capacity rejection
Mounting geometry Normal to sample surface
Mounting port DN40/CF70 (2.75") OD
Vacuum compatibility 1 x 10-9 mBar
Flange to sample size User defined
UHV cell DN63 spherical chamber (Kimball Physics)
Warranty Twelve months
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KP Technology
Burn Street, Wick, Caithness, KW1 5EH, Scotland

Telephone: +44 (0)1955 602 777
Fax: +44 (0)1955 602 555
Email: sales@kelvinprobe.com

(c) 2021 KP Technology Ltd

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