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While it is known that strongly correlated transition metal oxides describedby multi-band Hubbard model show microscopic multiscale phase separation littleis known on the possibility to manipulate them with vacuum ultraviolet (VUV) 27eV lighting. We have investigated the photo-induced effects of VUV illuminationof a super-oxygenated La2NiO4+y single crystal by means of scanningphotoelectron microscopy. VUV light exposure induces the increase of thedensity of states (DOS) in the binding energy range around Eb =1.4 eV below EF.The photo-induced states in this energy region have been predicted as due toclustering of oxygen interstitials by band structure calculations for largesupercell of La2CuO4.125. We finally show that it possible to generate andmanipulate oxygen rich domains by VUV illumination as it was reported for X-rayillumination of La2CuO4+y. This phenomenology is assigned tooxygen-interstitials ordering and clustering by photo-illumination formingsegregated domains in the La2NiO4+y surface

VUV Pump and probe of phase separation and oxygen interstitials in La2NiO4+y using spectromicroscopy