UV Source 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 and 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 of 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 (helium, neon, krypton, argon, xenon or hydrogen)
  • Manual or auto ignition
  • Easy operation
  • Stable output
  • Cold cathode capillary discharge
  • Electronically stabilised discharge current
  • Windowless, direct sight connection
  • Software control (basic version)


  • Software extension – can be integrated with RAPID SE
  • Gas dosing system
  • Customised insertion length
  • Linear shift
  • Differential pumping (2 stages)


Technical data

Mounting flange: DN 40 CF
Bakeout temperature: 150°C
Water cooling: required
Photocurrent: 1...80 nA
Discharge current: 40...250 mA
Beam divergence Small beam divergence: <1°
Insertion length: 220 mm (standard), other on request
Photon flux: >1016 photons / s*sr
He I / He II ratio: Better than 1:3
Port aligner: Integral , +/- 4°
Capillary I.D.: 1.5 mm (others on request)
Spot size: Dependent on working distance