The surface plasmon resonance of gold nanoparticles (NP) is investigated, allowing their sizes before and after X ray irradiation to be determined. It is shown that X ray irradiation results in the growth of NP, while their heat treatment results in their reduction. The quasi atomic structure of gold NP is assumed, leading to the entrapment of electrons on unoccupied orbitals upon X ray irradiation. An explanation of the crystallization and amorphization of photostructured glass in the lithium silicate system is suggested based on the fact that gold NP are negatively charged.
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