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Computational Study of Sulfur Sensitizing Centers on AgBr

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The structure and properties of a variety of sulfur centers are calculated using an embedded cluster method with the density functional method. Models representing adsorbed silver sulfide molecules and compensated surface and bulk substitutional monomer and dimer sulfide are treated. The molecule Ag4S2 partially incorporated into the surface is calculated to have an electron trapping depth of several tenths of an electron volt and a lowest singlet absorption in the long-wavelength range, both of which are consistent with reported experimental measurements of sensitized surfaces. Substitutional dimeric sulfide units incorporated into the surface or bulk and compensated by interstitial silver ions were not found to trap electrons, but holes could be trapped at this center. The ions at a positive kinks containing substitutional sulfide were found to be displaced upon electron trapping indicating a strong coupling of the electron to the crystal lattice. The energy levels, structure and absorption energies calculated for these and related centers are presented and discussed.
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Document Type: Research Article

Publication date: 2001-05-01

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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