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Unusual generation of molecular oxygen confined in a void inside the bulk of GeO(2) glass is observed with the Raman spectroscopy. The voids are formed by single tightly-focussed femtosecond laser pulses, converting a host glass material into a high temperature plasma, which explodes creating a void and inducing unexpected phase transformations. The intensity of the 1556 cm(-1) Raman line, that is a signature of molecular oxygen, increases with pulse energy. The mechanism of O(2) formation and material synthesis in plasma is presented and its relevance to fundamental problems of matter at high-pressure and temperature conditions and subject to geo-physical sciences is discussed

Observation of O_2 inside voids formed in GeO_2 glass by tightly-focused fs-laser pulses