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Coherent light is divided into a reference and a probing beam at a beam splitter. The reference mirror is mounted onto a piezoelectric transducer driven by a sawtooth generator triggered by a clock. The probing beam is focused by a lens onto the reflecting ...
We present a striking new Hubble Space Telescope (HST) observation of the rich cluster Abell 2218 taken with the Wide-Field and Planetary Camera (WFPC2). HST's restored image quality reveals a sizeable number of gravitationally-lensed features in this clus ...
A new lidar for the measurement of tropospheric ozone is proposed, based on the differential analysis of the Raman backscattered signals on nitrogen and oxygen, which is far less sensitive to the aerosols than the classical DIAL system. Using a third Raman ...
The sensitization of a semiconductor-based oxidoreduction photocatalyst is carried out by fixing at its surface a colour carrier comprised of a fragment of a transition metal complex such as ruthenium, chromium or iron and of a ligand of the bipyridyl or p ...
The stability of magnesite (MgCO3) has been studied by Raman spectroscopy at high pressure and high temperature using a diamond-anvil cell heated by a CO2 laser. Raman spectra up to 32 GPa at room temperature unambiguously confirm that under quasi-hydrosta ...
