We have measured the polarization of fluorescence emitted by the noble gases He, Ne, Ar, Kr, and Xe following impact excitation by polarized electrons. In He, the 3P→2S transition was studied; in the heavy noble gases the np(n11)p D3→np(n11)s P2 transitions were analyzed. We investigated these transitions as candidates for efficient optical electron polarimetry and found that, because of their ...

für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...

In the race toward attosecond pulses, for which high-order harmonics generated in rare gases are the best candidates, both the harmonic spectral range and the spectral phase have to be controlled. We demonstrate that multilayer extreme-ultraviolet chirped mirrors can be numerically optimized and designed to compensate for the intrinsic harmonic chirp that was recently discovered and that is res...

The problem of radon in dwellings gained importance in 1984 after an incidence in Pennsylvania, USA; thereafter several measuring techniques have been developed and national survey programs were started throughout the world for monitoring radon levels by government authorities. The lots of work have done by researchers in this field throughout the world. Several developed countries have given g...

This paper seeks to analyse the role of institutions and entrepreneurship in the field of green innovation in Wales. Green innovation can be defined as innovations in environmentally responsible products and services that are both sustainable and contribute to reducing the impact of greenhouse gases (GHG) upon the environment. The paper adopts a standard co-evolutionary perspective that will ta...

In the last few years, we have gathered experience in measurement of 222 Rn in air, water and soil-gas by absorption in polycarbonates. The method employs the remarkable absorption ability to noble gases of some polycarbonates, like Makrolon ® (the basic constructive material of CDs/DVDs). This report summarizes the key results of research and practical applications of this method. Calibration ...

Ultrafast extreme ultraviolet (XUV) sources with a controllable polarization state are powerful tools for investigating the structural and electronic as well as the magnetic properties of materials. However, such light sources are still limited to only a few free-electron laser facilities and, very recently, to high-order harmonic generation from noble gases. Here we propose and numerically dem...