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This article reports on the achievement of actual laser ͑spectral͒ selectivity in the field ion microscopy technique: when irradiating needle tips fabricated from heat-treated red light-filter glass by radiation from a copper vapor laser, light-absorbing CdS x Se 1Ϫx nanocrystallites present in the transparent glass matrix were registered in the form of bright spots against a dark background in photoion images. Mean radii of the observed nanocrystallites are equal to 10-15 nm which correspondsdoi:10.1063/1.1149194 fatcat:zb4fzeotl5ghtcvz2bd7wtbglq