Concept

Photon counting

Publications associées (98)

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Using photoelectron emission microscopy with hard-X-rays

Giorgio Margaritondo

We present several successful test cases of using photoelectron emission microscopy (PEEM) for photon energy up to 25 keV. First, the full extended X-ray absorption fine structure analysis was implemented in areas as small as 100 mum(2) for transition-meta ...

2001

Geometric distortion corrections for fiber-optic tapers in X-ray charge-coupled-device detectors

Gervais Chapuis

A simple algorithm is proposed for quantifying and correcting geometric distortions introduced by fiberoptic tapers in an X-ray charge-coupled-device detector with direct taper coupling. [References: 8] ...

1999

Quasicrystalline nature of quasicrystal surfaces: A photoemission study

Differently prepared surfaces of quasicrystalline i-Al-Pd-Mn are analyzed using angle-resolved photoemission in the X-ray and ultraviolet range of photon energies. Depending on the preparation, we find both surfaces with crystalline structure and metallic ...

1999

Photoemission electron microscopy studies of Pt/GaP(001) buried interfaces

Giorgio Margaritondo

Using (secondary) photoelectron emission microscopy, we studied the fully formed 80 Angstrom Pt/n-GaP(001) interface with a lateral resolution better than 2 mu m. We probed the chemically etched and sulfur passivated GaP(001) surface by ultraviolet and sof ...

1996

Quantization, Doppler shift and invariance of the speed of light: some didactic problems and opportunities

Giorgio Margaritondo

I discuss some of the didactic problems in the introduction to quantum physics based on the concept of photon. I specifically argue that the derivation of the photon energy from the relativistic Doppler shift offers stimulating didactic opportunities. A de ...

1995

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

Photochemical etching of Cu and GaAs with Cl2 in the VUV

Majed Chergui, Bo Li

Photochem. reactions and etching efficiencies of polycryst. Cu and GaAs(100) with Cl2 were studied in the spectral range of 105-300 nm by using synchrotron radiation and for Cl2 pressures between 10-6 and 10 mbar. Dissocn. of Cl2 leads in the case of Cu to ...

1992

Polarization Dependence of 2-Photon Transitions in Quantum-Wells

Alfredo Pasquarello

We give explicity the polarization dependence of two-photon subband-subband transitions in semiconductor quantum wells. We consider transitions from heavy-hole subbands as well as from light-hole subbands. We study the polarization dependence in the case o ...

1991