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Spectroscopic infrared near-field microscopy and x-ray reflectivity studies of order and clustering in lipid membranes

Publications associées (41)

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Scanning near-field infrared microscopy and spectromicroscopy applied to nano-systems and cells

Dusan Vobornik

This thesis further explores the possibilities of scanning near-field optical microscopy (SNOM) in both materials and life sciences. Two experimental SNOM setups were developed: one designed for infrared spectroscopy applications and the other for the imag ...

EPFL2005

Optical nanospectroscopy applications in material science

Giorgio Margaritondo, Giovanni Longo, Dusan Vobornik

The advent of scanning near-field optical microscopy (SNOM) has augmented at a microscopic level the usefulness of optical spectroscopy in the region between 300 nm and 10 mum. Two-dimensional imaging of chemical constituents makes this a very attractive a ...

2004

IR-SNOM on lithium fluoride films with regular arrays based on colour centres

Giorgio Margaritondo, Giovanni Longo

LiF films have been grown on silicon substrate, irradiated with soft x-rays to create fluorescent regular micrometric-spaced arrays based on colour centres, and studied by Scanning Near-field Optical Microscope (SNOM). Strong variations in the local reflec ...

Wiley-Vch, Inc2003

Real-time signal analysis on the TCV PHA diagnostic

Basil Duval

A pulse height analysis (PHA) x-ray system has been successfully implemented on the tokamak TCV, aiming at a low cost monitor system of the plasma electron temperature and impurity content. To meet the need for high throughput and fast acquisition, mandato ...

2003

X-ray imaging techniques and exobiology

Philippe Gillet

X-ray imaging techniques at the best spatial resolution and using synchrotron facilities are put forth as powerful techniques for the search of small life forms in extraterrestrial rocks under quarantine conditions. Absorption and fluorescence X-ray microt ...

2003

Chemically resolved imaging of biological cells and thin films by infrared scanning near-field optical microscopy

Giorgio Margaritondo

The infrared (IR) absorption of a biological system can potentially report on fundamentally important microchemical properties. For example, molecular IR profiles are known to change during increases in metabolic flux, protein phosphorylation, or proteolyt ...

2003

Mass selected cluster deposition in strongly or weakly interacting media

Wolfgang Harbich

Mass selected cluster deposition is discussed with respect to three questions: what is the integrity of the clusters after deposition; are they uniform in terms of size and isomerisation; and finally what is the influence of the support on the clusters? Th ...

2002

Use of photoelectron microscopes as X-ray detectors for imaging and other applications

Giorgio Margaritondo

We demonstrate with practical tests that a photoelectron emission microscope (PEEM) can be advantageously used as a high-lateral-resolution detector of X-rays. The advantages of this approach are discussed, in particular for coherence-based techniques. (C) ...

1999

Discovery of microsecond time lags in kilohertz QPOs

Demetri Psaltis

Using the Rossi X-Ray Timing Explorer, we have measured similar to 27 mu s time delays in 830 Hz quasi-periodic oscillations (QPOs) between 4-6 and 11-17 keV in 4U 1608-52, with high-energy photons lagging low-energy photons, and found upper limits to the ...

1997

X-Ray Microscopy and Spectromicroscopy

Giorgio Margaritondo

Progress in the instrumentation and, in particular, in the photon sources makes it possible to implement a number of established X-ray spectroscopies in a high-lateral-resolution mode. We discuss the general trends of this field, and then we present a deta ...

1992