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A hydrogen microwave discharge resonance lamp (Opthos Instruments) is interfaced with the vacuum chamber through an MgF window; from this lamp 10.2 eV (=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 with respect to the ion beam. This gives the unique opportunity to simultaneously process the samples with ions and UV photons.