Absorption Spectra of Metal Atoms Adsorbed on the Surface of a Single Crystal

Латышев, А. Н.; Ovchinnikov, O. V.; Okhotnikov, S. S.

doi:10.1023/b:japs.0000016295.19263.97

Cited by 11 publications

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“…Some success has been achieved by using luminescence techniques such as photostimulated flash luminescence, for example [9,10]. Such problems have been successfully solved for atoms and clusters of a metal by itself, in particular silver on the surface of silver chloride [11,12]. This work has been devoted to studies of the spectral properties of individual silver atoms adsorbed on the surface of a ZnS crystal.…”

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Photoionization spectra of silver atoms adsorbed on the surface of a ZnS single crystal

et al. 2006

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We have used photostimulated flash luminescence to study deep electronic states arising when silver ions Ag + are deposited under high vacuum onto the surface of a ZnS single crystal, followed by creation of the conditions for neutralization of the silver ions. The flux density of the silver ion beam was 10 7 cm -2 ⋅sec -1 . We have observed the appearance of two types of deep electronic states with photoionization energies 1.60 eV and 1.80 eV, arising after depositing the silver ions onto the surface of the ZnS single crystal. We have hypothesized that there may be two different preferred sites for adsorption of silver atoms on the zinc sulfide surface. The corresponding photoionization spectra of the adsorbed silver atoms have maxima at 775 nm and 690 nm.Key words: adsorbed silver atom, zinc sulfide, photoionization spectrum, photostimulated flash luminescence. Introduction.Today there is considerable interest in development of modern methods and principles for making nanoparticles and nanostructures. Such problems are relatively easy to solve, for example, for molecules when their capacity for self-organization is utilized, and for small atomic clusters and nanoparticles that can be prepared during chemical synthesis and incorporated into foreign matrices and porous structures [1][2][3][4][5]. A number of papers (see, for example, [6-8]) demonstrate the possibility of sequential photostimulated assembly of adsorbed nanoparticles from atoms and small atomic clusters. During such investigations, there are problems involved in obtaining individual, noninteracting atoms and monodisperse small atomic clusters adsorbed on the surface of real ionic/covalent crystals. However, so far in most cases the optical and other properties are still unknown for atoms and small atomic clusters of a strictly determined size that are adsorbed on the surface of crystals. Such problems can be solved only when these centers are present on the real crystal surface in concentrations ruling out their pairwise interaction and their joining into systems of another size, and making up at least 10 -3 to 10 -6 of the monolayer. However, sometimes it is simply impossible to observe such low concentrations of adsorbed centers using standard procedures. Some success has been achieved by using luminescence techniques such as photostimulated flash luminescence, for example [9,10]. Such problems have been successfully solved for atoms and clusters of a metal by itself, in particular silver on the surface of silver chloride [11,12]. This work has been devoted to studies of the spectral properties of individual silver atoms adsorbed on the surface of a ZnS crystal. We have not encountered similar research in the scientific literature. We also know that deep electronic states appear upon adsorption of silver particles of atomic or molecular dispersity on the surface of zinc sulfide crystals [13]. The practical use of such deep electron traps is certainly promising (see, for example, [14]).We obtained the photoionization spectra of adsorbed silver ato...

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“…We should especially note that we did not randomly select the photostimulated flash luminescence method to solve such a problem; we chose it because of its unique concentration sensitivity at the level of parts per million of the monolayer of the crystal surface [11,12].…”

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Photoionization spectra of silver atoms adsorbed on the surface of a ZnS single crystal

et al. 2006

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“…The formation of clusters containing few atoms from adsorbed atoms and subsequent enlargement of the clusters necessitate that the size of the centers be controlled over the whole assembly process. This problem can in principle be solved for the deposition of separate atoms that do not interact with each other and uniform clusters of few atoms on the surface of luminescing crystals in which photostimulated luminescence flash (PSLF) occurs [9][10][11][12]. Deep traps arising as a result of the adsorption of metal atoms and clusters of few atoms on the surface of ionic-covalent crystals can be investigated using PSLF.…”

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Photoionization spectra of silver dimers adsorbed on the surface of a ZnS single crystal

et al. 2007

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We use the photostimulated luminescence flash method to measure photoionization spectra of Ag 2 clusters adsorbed on the surface of a ZnS single crystal. Adsorbed dimers of silver are prepared by treatment of the surface of a ZnS single crystal in high vacuum with a beam of molecular Ag 2 + ions followed by their neutralization. We show that the adsorbed dimers create two types of electron traps at energy levels 1.63 and 1.82 eV below the bottom of the conduction band.

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“…Thus, the SPB method allows one to control the changes in the spectra of the deep electronic states, via which ASL is excited. An important feature of this method is its unique concentration sensitivity, which makes it possible to determine millionth parts of a monolayer occupied by surface centers [12] and, consequently, to detect the initial stages of formation of the primary products of a stimulated photochemical process -atoms and small-atom adsorbed clusters of metals.…”

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“…from the bottom of the conduction band by a value that can be determined from the photoionization spectra (constructed on the basis of the SPB data) of adsorbed monodisperse centers [12,13]. The red boundary of such a spectrum is offset by 0.15-0.20 eV (Stokes shift) from the maximum of the spectra of silver atoms and dimers adsorbed on the AgCl surface.…”

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Anti-stokes luminescence of solid AgCl0.95I0.05 solutions

et al. 2005

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An anti-Stokes luminescence band with λ max = 515 nm of microcrystals of solid AgCl 0.95 I 0.05 solutions excited by a radiation flux of density 10 13 -10 15 quanta/cm 2 ⋅sec in the range 600-800 nm at 77 K was detected. It is shown that the intensity of this luminescence and the frequency of its excitation depend on the prior UV-irradiation of samples. Analysis of the stimulated-photoluminescence spectra and the anti-Stokes luminescence excitation spectra of the indicated microcrystals has shown that to the centers of anti-Stokes luminescence excitation correspond local levels in the forbidden band of the crystals. These states are apparently due to the atomic and molecular disperse silver particles that can be inherent in character or formed as a result of a low-temperature photochemical process.

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Absorption Spectra of Metal Atoms Adsorbed on the Surface of a Single Crystal

Cited by 11 publications

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Photoionization spectra of silver atoms adsorbed on the surface of a ZnS single crystal

Photoionization spectra of silver atoms adsorbed on the surface of a ZnS single crystal

Photoionization spectra of silver dimers adsorbed on the surface of a ZnS single crystal

Anti-stokes luminescence of solid AgCl0.95I0.05 solutions

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