Valved Alkali Metal Source

Evaporation of Elemental High Vapor Pressure Alkali Metals

The main purpose of the Valved Alkali Metal Source is the controlled evaporation of elemental alkali metals like Cs or Rb from the heated reservoir inside the cell into a vacuum chamber under high to ultra-high vacuum conditions (i.e. pressures below 1x10-6 mbar/torr).

Typical applications for the AKS are:

  • layer growth of Cs or Rb in MBE and surface science applications
  • MBE fabrication of alkali metal based electronic devices, e.g. infrared-sensitive photocathodes