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The UV lamp

A hydrogen microwave discharge resonance lamp (Opthos Instruments) is interfaced with the vacuum chamber through an MgF$_{2}$ window; from this lamp 10.2 eV ($\lambda$=121.6 nm) photons are obtained. An aluminium light collector is placed at the end of the lamp in order to increase the number of UV photons which reaches the sample. A light detector, placed at the end of the aluminium light collector, is used to measure the UV flux during photolysis. The detector is a platinum wire which gives a current, by the photoelectric effect, proportional to the UV flux. The UV flux is perpendicular to the sample holder and forms an angle of 45$^o$ with respect to the ion beam. This gives the unique opportunity to simultaneously process the samples with ions and UV photons.

Innocenza Busa' 2005-11-14