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Anisotropy Spectroscopy (anisotropy + spectroscopy)

Distribution by Scientific Domains

Physics and Astronomy	100%

Kinds of Anisotropy Spectroscopy

reflection anisotropy spectroscopy

Selected Abstracts

A reflectance anisotropy spectroscopy study of underpotential deposition of copper onto Au(110)

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 13 2005
C. I. Smith
Abstract The underpotential deposition of Cu on Au(110) has been monitored by Reflection Anisotropy Spectroscopy (RAS). The changes in the intensity of spectral features observed at 2.6 eV and 3.4 eV in the RA spectrum of Au(110) that are induced by the deposition of Cu occur on different timescales. It is suggested that these changes arise, respectively, from the partial quenching of surface states and from changes in surface morphology. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Investigation of molecule chemisorption on Si(001)2 × 1 surfaces by surface reflectance spectroscopies

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 13 2005
O. Pluchery
Abstract Several examples are given on the investigation of adsorption of atoms and molecules on Si(001)2 × 1 in ultra-high vacuum, by means of two different surface optical spectroscopies, the Surface Differential Reflectance Spectroscopy and the Reflectance Anisotropy Spectroscopy. Hydrogen, water, oxygen, benzene and pyridine adsorptions are presented. Specific spectra are obtained, which are interpreted as a function of the mode of adsorption of the adsorbates. In particular, it is possible to discriminate between adsorption on the dangling bonds of the Si dimers and adsorption inducing a breaking of the dimers. Moreover, quantitative information is obtained from these optical techniques which yields the determination of the absolute number of surface Si atoms involved in the bonding. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Reflection anisotropy spectroscopy of biological molecules with the 4GLS source

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 8 2008
P. Weightman
Abstract The main characteristics of the UK Fourth Generation Light Source (4GLS) are described. It is explained how the output of 4GLS could be used in studies of biological systems using Reflection Anisotropy Spectroscopy (RAS). (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Optical investigation of CuPc thin films on vicinal Si(111)

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 2 2010
Li Ding
Abstract CuPc thin films were grown on the hydrogenated vicinal Si(111) surfaces by organic molecular beam deposition (OMBD). Spectroscopic ellipsometry was employed to determine the refractive index (n) and extinction coefficient (k). Furthermore, the ratio of the out-of-plane to the in-plane absorption intensity provides the average tilting angle of molecules in the film. Reflectance anisotropy spectroscopy (RAS) shows the optical anisotropy of CuPc thin films induced by the vicinal Si(111) surfaces, which indicates the in-plane orientation of molecules. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Reflectance anisotropy studies of 5×2-Au structures grown on Si(111) surfaces with different step formations

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 8 2008
J. Jacob
Abstract Reflection anisotropy spectroscopy (RAS) studies are reported of Si(111)-5×2-Au structures grown on substrates with different offcuts and step densities. Such substrates produce a predominant domain on the (111) terrace that would otherwise produce a negligible RAS signal, due to domain averaging. Changes in the RAS spectra with offcut angle are observed in the 1 to 3 eV region, where Au-induced structures appear. Results from offcuts towards [2] of 2°, 3°, 9.5°, and -4° are presented. The variation in the RAS spectra is consistent with different populations of single- and double-chain gold structures formed in the region of the steps. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Reflection anisotropy spectroscopy of biological molecules with the 4GLS source

Temperature dependent reflection anisotropy spectroscopy investigations of vanadyl phthalocyanine films

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 5 2008
Michael Fronk
Abstract The optical anisotropy of VOPc films is investigated in the temperature range from 300 K to 10 K by reflection anisotropy spectroscopy in the energy range from 1.5 eV to 5.5 eV. With changing temperature all spectral features show reversible changes in their relative intensity. The most pronounced changes are observed in the sub-structure of the Q band related feature when cooling down from 300 K to 100 K indicating a reversible structural modification of the films assisted by the illumination. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

The adsorption of L-cysteine on Au(110) in ultra-high vacuum and electrochemical environments

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 12 2005
G. E. Isted
Abstract We have investigated the adsorption of L-cysteine (L-Cys) onto Au(110) in an electrochemical cell and under ultra-high vacuum (UHV) conditions using reflection anisotropy spectroscopy (RAS). The L-Cys saturated surfaces created by both deposition methods exhibit similar RA profiles which indicates a similar adsorption process. Our results are consistent with L-Cys binding to the Au(110) surface through a goldthiolate (Au-S) linkage. Heating the L-Cys saturated surface in UHV to 580 K results in the decomposition of the adsorbate and leaves behind a sulphur/Au surface composed of different structural domains. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]