Concept

Absorption du rayonnement électromagnétique par l'eau

Publications associées (303)

First solvation shell of the Cu(II) aqua ion: Evidence for fivefold coordination

André Merbach, Alfredo Pasquarello, Lothar Helm, Eva Jakab Toth, Roberto Car

We determined the structure of the hydrated Cu(II) complex by both neutron diffraction and first-principles molecular dynamics, In contrast with the generally accepted picture, which assumes an octahedrally solvated Cu(II) ion, our experimental and theoret ...

American Association for the Advancement of Science2001

Influence of pressure on the optical properties of InxGa1-xN epilayers and quantum structures

Nicolas Grandjean

The influence of hydrostatic pressure on the emission and absorption spectra measured for various types of InGaN structures (epilayers, quantum wells, and quantum dots) is studied. While the known pressure coefficients of the GaN and InN band gaps are abou ...

2001

Optical spectral probing for epithelial tissue characterisation

Philippe Thueler

In this thesis, a new method has been developed, which determines the optical coefficients spectra (absorption and scattering) of small volumes of tissue (1 mm3) by the measurement of spatially resolved reflectance between 480 and 950 nm. Firstly, an algor ...

EPFL2001

Ozone and water-vapor measurements by Raman lidar in the planetary boundary layer: Error sources and field measurements

Hubert van den Bergh, Bertrand Calpini, Valentin Simeonov, Gilles Larchevêque, Valentin Mitev

A new lidar instrument was developed to measure tropospheric ozone and water vapor at low altitude. The lidar uses Raman scattering of an UV beam from atm. nitrogen, oxygen, and water vapor to retrieve ozone and water-vapor vertical profiles. By numerical ...

2001

Direct observation of new transitions in the absorption spectra of a V-groove quantum wire waveguide

Elyahou Kapon, Alok Rudra, Marc-André Dupertuis, Daniel Oberli, Klaus Leifer

We report on the direct absorption measurement of the polarization selection rules in a V-groove QWR waveguide. Attenuation measurements in a 1 mm long waveguide were performed from 10 K up to room temperature. These measurements yielded the QWR DOS select ...

2000

Feasibility tests of transmission x-ray photoelectron emission microscopy of wet samples

Giorgio Margaritondo

We performed feasibility tests of photoelectron emission spectromicroscopy of wet samples in the water window (285-532 eV) soft x-ray spectral region. Water was successfully confined in an ultrahigh vacuum compatible compartment with x-ray transparent side ...

2000

Is light absorption by excitons in quantum wells an intrinsic process?

Benoît Marie Joseph Deveaud, Ursula Oesterle, Cristiano Ciuti

A novel method of controlling light absorption by exciton-polaritons is presented. The coherent light-induced coupling of excitons in multiple quantum well Bragg structures is exploited to sup press dramatically the absorption. Our results show that excito ...

2000

Spectral hole burning in naphthalocyanines derivatives in the region 800 nm for holographic storage applications

Demetri Psaltis

Persistent spectral hole burning is studied for several free-based and metallo-naphthalocyanine derivatives in polymer hosts. These materials exhibit a strong 0-0 absorption band in the region 800 nm matching the wavelength range of most semiconductor diod ...

2000

Photoabsorption and core-level photoemission study of ruthocuprates

Giorgio Margaritondo, Luca Perfetti

We report on x-ray photoemission and absorption measurements on ruthocuprate and SrRuO3 samples. The ruthocuprates include samples that are both weak ferromagnets and superconductors for part of the phase diagram. The results indicate that adding hydrogen ...

2000

Wannier-function description of the electronic polarization and infrared absorption of high-pressure hydrogen

Nicola Marzari

We have constructed maximally localized Wannier functions for prototype structures of solid molecular hydrogen under pressure, starting from local-density approximation and tight-binding Bloch wave functions. Each occupied Wannier function can be associate ...

2000

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