منابع مشابه
IMPURITY CENTRES.Ni+ and Ni3+ centers in X-irradiated CaF2
— Optical and EPR measurements of CaF2 : Ni before and after X-irradiation are reported. An absorption band at 255 nm grows during X-irradiation. The thermal evolution of this band and some bleaching experiments in 15 K X-irradiated samples containing VK centers indicate that the 255 nm band is due to Ni + centers. Some EPR signals associated with the Ni centers are also observed. Low temperatu...
متن کاملConductive nanodots on the surface of irradiated CaF2
CaF2(111) single crystal surfaces have been irradiated with swift heavy ions under oblique angles resulting in chains of nanosized hillocks. In order to characterize these nanodots with respect to their conductivity we have applied non-contact atomic force microscopy using a magnetic tip. Measurements in UHV as well as under ambient conditions reveal a clearly enhanced electromagnetic interacti...
متن کاملProbing electron induced defects in CaF2 by photothermal displacement
The surface displacement technique is used to measure the temperature and frequency dependence of the periodic expansion of a CaF2-surface subject to a modulated focused beam of lkeV electrons. Theoretical models are presented for a prediction of the observed phenomena based on thermal transport and defect lifetime effects. The use of such investigations for the study of thermal and non-thermal...
متن کاملElectron-loss and Electron-capture Processes in Irradiated Systems
The use of ionizing radiation as a method for electron extraction and electron attachment under conditions in which the products are matrix-isolated are outlined, and the utility and simplicity of the method is stressed. A range of electron-loss and electron-gain mechanisms are discussed in terms of molecular relaxation, bond-making and bond-breaking processes, with particular reference to solv...
متن کاملCharge Dynamics in Electron-Irradiated Polymers
Recent studies of charge trapping and charge transport in polymer lms irradiated and charged with monoenergetic electrons of range smaller than the sample thickness and thereafter stored or annealed under various conditions are discussed. An analytical model used to describe the phenomena takes the following parameters into consideration: Charge and energy deposition pro les, charge drift due t...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1967
ISSN: 0031-9007
DOI: 10.1103/physrevlett.18.1123