Near Metal Surfaces

jf is the fluorescence intensity far away from the metallic substrate and is 

Although the details of these electrcxiic coupling schemes may be rather complicated (depending, e.g., on the chromophore orientation) it is still possible to draw a few qualitative conclusions for the practical situation in SPFS. No matter which mechanism for the dye-metal coupling may be operational leading to an undesired loss of 

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Baer R and Kosloff R 1997 Quantum dissipative dynamics of adsorbates near metal surfaces a surrogate Hamiltonian theory applied to hydrogen on nickel J. Chem. Rhys. 106 8862... 

Sulfides are intermixed with iron oxides and hydroxides on carbon steels and cast irons. The oxides are also produced in the corrosion process (Reaction 6.6). Although theoretical stoichiometry of 1 to 3 is often suggested between sulfide and ferrous hydroxide, empirically the ratio of iron sulfide to ferrous hydroxide is highly variable. Sulfide decomposes spontaneously upon exposure to moist air. Additionally, corrosion-product stratification is marked, with sulfide concentration being highest near metal surfaces. 

The dipole density profile p (z) indicates ordered dipoles in the adsorbate layer. The orientation is largely due to the anisotropy of the water-metal interaction potential, which favors configurations in which the oxygen atom is closer to the surface. Most quantum chemical calculations of water near metal surfaces to date predict a significant preference of oxygen-down configurations over hydrogen-down ones at zero electric field (e.g., [48,124,141-145]). The dipole orientation in the second layer is only weakly anisotropic (see also Fig. 7). 

E. Spohr. Computer simulaton of the structure and dynamics of water near metal surfaces. In G. Jerkiewicz, M. P. Soriaga, K. Uosaki, A. Wieckowski, eds. Solid-Liquid Electrochemical Interfaces, Vol. 656 of ACS Symposium Series. Washington ACS, 1997, Chap. 3, pp. 31-44. 

Enhanced Absorbance of Molecules Near Metallic Surfaces. 181... 

It is well known that luminescent molecules near metal surfaces can suffer dramatically reduced luminescent quantum yields and lifetimes. This is attributed to non-radiative energy transfer to the metal surface [31]. This phenomenon is thought to commence when the luminescent species lies up to 200 A from the metal surface. Therefore, this form of quenching is expected to be particularly prevalent in... 

Lpiuo—i - ivr. It is clear in this case that a large fluorescence quenching occurs, and this is partly the origin of the common view that fluorescence near metal surfaces is always quenched. Even if FDMEF exists in such a case, its intensity would not be detectable. 

Unified Treatment of Fluorescence and Raman Scattering Processes near Metal Surfaces. Physical Review Letters 93 243002/243001-243002/243004. 

In Figure 16.3, the excitation / relaxation electric fields that can interact with organic semiconductor are from the incident light field (E) and metal field (Em) for excitation and near metal surface quenching of non-radiative decay rates the radiative decay rate (F), metal radiative rate (F,), and metal radiative decay rate... 

Figure 16.3 Modified Jablonski diagram ows the energy absorption effects of near metal surface enhanced fluorescence. The process involves o eating an excited electronic singlet state by optical absorption and subsequent emission of fluorescence with different decay paths.

L. Delle Site, C. F. Abrams, A. Alavi, and K. Kremer (2002) Polymers near metal surfaces Selective adsorption and global conformations. Phys. Rev. Lett. 89, p. 156103 M. Praprotnik, L. DeUe Site, and K. Kremer (2005) J. Chem. Phys. 123, p. 224106... 

With the present paper we pay a tribute to our friend and teacher A. P. Kazantsev. He made the seminal contribution to the now enormous field of activity of mechanical action of light on neutral atoms. He often prophesied the future development for years ahead. Four decades ago he recognized the significance of radiation from accelerated charged particles near metallic surfaces [Kazantsev 1963] that appears to be of importance for dissipative mechanisms in TOT electron transport. 

The quenching of excited states near metal surfaces has been reviewed extensivelyand only the main results will be summarised here. The classical approach calculates the damping due to near field coupling (for radiation field effects see 38) of an oscillating adsorbate dipole, a distance d above a metal surface, to the metal electrons. The equation for the damping constant is37,39... 

Alkali and halide ion adsorption near metal surfaces has been investigated by a variety of groups. A simple (9-3) Lennard-Jones potential, first used by Lee et al. 

In this section I hope to show how the sensitivity of laser spectroscopy is exploited to obtain data on very low concentrations of atoms. In particular I will start off by considering a few laser atomic beam studies aimed at measuring optical isotope shifts and show how short-lived nuclei can be studied in this way. I shall also mention how it is possible to beat the natural linewidth and obtain supernatural spectra . The discussion of laser studies at low atomic concentrations then leads me onto consider experiments on laser cooling and trapping of atoms and ions. In this context I will also mention some experiments using the shelved electron idea to detect very weak transitions. Finally, I will say something about Rydberg atoms and the effects of atoms near metallic surfaces. 

F ure 3.21 Typical concentration profiles near metal surfaces for the interpretation of XPS data (a) uniform concentration (b) exponential decay (c) concentration step function. 

Computer Simulation of the Structure and Dynamics of Water Near Metal Surfaces... 

Adsorption energy, effect on density, computer simulation of structure and dynamics of water near metal surfaces, 34-36... 

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