Results 231 to 240 of about 2,982 (265)

Sum rules in surface differential reflectivity and reflectance anisotropy spectroscopies

Applied Surface Science, 2001
Abstract The sum rule for the imaginary part of the dielectric function e″ can help in discriminating surface and bulk-related optical transitions, by means of the number of electrons taking part in the transitions. This is particularly simple in the region below the main critical points of the bulk band structure (below 3.5 eV for Si, below 2.2 eV ...
G Chiarotti, P Chiaradia, F Arciprete, C Goletti   +3 more
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Molecular orientation studied by reflection anisotropy spectroscopy

physica status solidi (b), 2010
AbstractA description of the reflection anisotropy spectroscopy (RAS) results from oriented thin films is presented. The RAS signals of a 1 nm thick film are simulated to investigate the effect of molecular tilt on the RAS response of the system. Whilst the spectroscopic measurements themselves appear to be relatively insensitive to the effects of the ...
P. D. Lane, G. E. Isted, R. J. Cole
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Analysis of the phase signal in reflection anisotropy spectroscopy

Semiconductor Science and Technology, 1995
In this study the analysis of reflection anisotropy signals reveals that an unusual behaviour of the phase signal may occur in the presence of weakly anisotropic surfaces. It will be shown that the measured lineshape has to be considered with extreme care if a single-phase lock-in amplifier is used in the experimental set-up. It not only depends on the
W Dietrich, M von der Emde, D R T Zahn
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Reflection Anisotropy Spectroscopy: A New Probe for the Solid-Liquid Interface

Physical Review Letters, 2000
Introducing reflection anisotropy spectroscopy (RAS) as a new probe for solid-liquid interfaces, we present results for the Au(110)/electrolyte interface which serves as a model system. We demonstrate that RAS is sensitive to surface phase transitions, step morphology, and electronic surface states.
, Sheridan, , Martin, , Power, , Barrett, , Smith, , Lucas, , Nichols, , Weightman   +7 more
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Stress-induced optical anisotropy in polycrystalline copper studied by reflection anisotropy spectroscopy

Journal of Physics D: Applied Physics, 2003
The optical properties of polycrystalline copper subjected to tensile stress are monitored in situ and in real time using reflection anisotropy spectroscopy (RAS). It is shown that RAS allows investigation of the plastic regime. Here, in contrast to the Hooke's law regime, the stress-induced RAS lineshape is found to be dependent on the applied stress.
R J Cole, S Kheradmand, D D Higgins, F Madani, B F Macdonald, V Koutsos, J R Blackford   +6 more
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Transient Reflective-Polarization Spectroscopy of Hidden Anisotropy in Cubic Crystals

Ultrafast Phenomena, 1994
It is often anticipated that the linear optical properties of GaAs as a cubic material are isotropic. More careful consideration, however shows that spatial dispersion terms in the optical response lead to a small linear birefringence in this crystal. The crystal anisotropy becomes more pronounced in the nonlinear optical response where the symmetry of
N. I. Zheludev, A. R. Bungay, S. V. Popov, Yu. P. Svirko   +3 more
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Aspects of reflectance anisotropy spectroscopy from semiconductor surfaces

Journal of Physics: Condensed Matter, 1998
There currently exists a wide range of powerful techniques for probing surfaces, mainly involving the use of electron or ion beams under high- or ultra-high-vacuum conditions. Recently there have been major efforts to develop surface sensitive optical probes that have the inherent advantage that they can be applied in more challenging environments such
Z Sobiesierski, D I Westwood, C C Matthai   +2 more
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Reflection anisotropy spectroscopy: a new probe of metal surfaces

Surface and Interface Analysis, 2001
Abstract Reflection anisotropy spectroscopy (RAS) is a non‐destructive optical probe of surfaces capable of operation within a wide range of environments. The RAS technique was developed to study semiconductor growth and more recently has been used to probe the optical properties of metal surfaces.
D. S. Martin, P. Weightman
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Polarizable dipole models for reflectance anisotropy spectroscopy: a review

Journal of Physics: Condensed Matter, 2004
We present a review of the formalism and application of polarizable dipole models that have been used to calculate reflectance anisotropy spectra of semiconductor and metal surfaces and thin organic films.
N Arzate, B S Mendoza, R A Vázquez-Nava
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REFLECTION ANISOTROPY SPECTROSCOPY: AN OPTICAL PROBE OF SURFACES AND INTERFACES

Surface Review and Letters, 2000
Reflection anisotropy spectroscopy (RAS) is a nondestructive surface-sensitive optical probe capable of operation within a wide range of environments. RAS has been applied to semiconductor surfaces and has found use as an in situ monitor of semiconductor growth.
D. S. MARTIN, P. WEIGHTMAN
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