UV Source UVS 40A2

The UV Source (UVS) is a high intensity Photon Source that can be operated with a variety of discharge gases. The UVS is water cooled for maximum stability and features fully interlocked safety circuitry. The discharge has a maximum photon intensity at a pressure of several mbar so dual differential pumping stages are employed in order to maintain the host chamber pressure. The UVS 40A2 is designed so that a continuous gas flow is maintained through the discharge region. This is a great advantage in maintaining the cleanliness of the discharge capillary and results in very long service intervals. The UVS 40A2 is used in UPS (ultraviolet photoelectron spectroscopy) research.


  • Can be operated with various discharge gases
  • Manual or auto ignition
  • Easy operation
  • Stable output
  • Special designed discharge chamber
  • Electronically stabilised discharge current
  • Windowless, direct sight connection


  • Gas dosing system
  • Customised insertion length
  • Linear shift (50 - 100 mm)
  • Differential pumping (required)
  • Chiller

Technical Data

Mounting flange DN 40 CF (non-rotatable)
Gases He, Ne, Ar, Kr, Xe, H2
Photocurrent 1 - 80 nA
Photon flux >1016 photons / s*sr
He I / He II ratio Better than 3:1
Water cooling required, pressure 2 - 3 bar (max. 6 bar), flow > 1.5 l/min, Tmax= 30 °C
Port aligner integral , +/- 4°
Discharge current 40 - 300 mA
Beam divergence small beam divergence: <1°
Capillary I.D. 1.5 mm (others on request)
Insertion length 220 mm (standard), other on request, OD: 9.5 mm
FWHM dependent on working distance (e.g. 1.2 mm for distance 10 mm)
Typical working distance 5 - 100 mm (optimum 5 - 50 mm)
Bakeout temperature up to 200 °C
Working pressure < 1 mbar

Related Product:

UV Source Power Supply UV40A-PS
The UV40A-PS power supply is intended to use with UV40A1 and UV40A2 for ultraviolet photoelectron spectroscopy (UPS).

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