Y. Petroff

X‐ray replication of masks using the synchrotron radiation produced by the ACO storage ring

Synchrotron radiation emitted by the 540‐MeV storage ring of the University of Orsay was used to replicate masks with submicron features on PMM resist. Exposure times were of the order of a few minutes. The masks used were gold (1500–3500 A thick) on 2.5‐μm Mylar. Calculations show that the wavelengths principally involved in making the exposure are at 540 MeV centered around 14 A and at 400 MeV around 50 A.

A new design for high flux grazing incidence monochromator for synchrotron radiation

Abstract Recent experiments at L.U.R.E. (Orsay) have shown the great capacity of grazing incidence monochromators based on holographic toroidal grating, previously described by D. Lepere. Good resolution (1 A with 100 μm slits) and high flux (>10 11 photons/A s) have been obtained with a very small model (0.3 m). A more sophisticated version (3 m) of this kind of monochromator has been designed and it is built now at L.U.R.E. (Orsay). The expected performances are described.

The development of toroidal grating monochromators at L.U.R.E.

Abstract In the last two years grazing incidence monochromators based on holographic toroidal gratings have been developed at L.U.R.E. The model described in this paper is a 3 m one (entrance slits-grating distance). Due to the large grazing angle (15°) it can be used between 10 and 150 eV∗. With the Orsay storage ring (A.C.O.) very high flux ( ∼4 × 10 12 phot / A · s at 100 eV and good resolution (0.1 A for 100 μm slits) have been obtained. Due to the large size of the grating (50 × 210 mm2) no decrease of the intensity has been observed after more than one year of use (>1200 h). Examples of angular resolved photoemission and fluorescence spectra will be shown.

High resolution electron spectroscopy of high Tc superconductors

Abstract It has been shown recently that photoemission and energy loss spectroscopy can bring important informations for the understanding of the electronic properties of high T c superconductors. In this paper we present and discuss results obtained by different groups using high resolution photoemission and energy loss spectroscopy.

Indirect Transitions in Photoemission of Semiconductors

Angular resolved photoemission spectra of PbS have been measured at T=300K and T = 20K in the energy range 18–100 eV. The purpose of this study was to understand the origin of indirect transitions previoulsy observed in the case of the lead salts. The spectra at low temperature show that indirect transitions dominate for 15

Use Of Undulators In Atomic, Molecular And Solid State Physics

After describing shortly the properties of undulators, we illustrate by few examples the usefulness of undulators in atomic, molecular and solid state physics.