Deuterium UV source

• High energy UV source
• Continuum source
• Water cooled
• No heat radiation

The FOCUS Deuterium source of is typically used for PEEM with high work function samples.

A mechanical and optical concept where the optical path can be flushed by a low absorbing gas like Argon (see comparison below) extends the energy range further.

The complete setup is combined with a portaligner and an in-vacuum lens to comprise an easy and efficient optimization of the photon flux at the region of interest of the PEEM sample (see drawing below).

The influence of Argon flushing onto the count rate and the energy distribution of UPS:

Dimensions of the complete D2 source: