The gas cell UGC 10 allows to perform UPS measurements on gas with smallest line width. The cell is tuned to work best with the SPECS UV-light Source UVS 10/35. It can be added simply to an excisting UVS 10/35. The special geometry of the cell including space charge
compensation electrodes provides a virtually uni-potential ionisation volume. Driven with well defined UV-light and sample gas (e.g. HeI or Ne on
Ar 3p lines) the source is well suited to demonstrate the ultimate energy resolution of electron energy analyzers.