Thermal stability of Mo/Si multilayer soft-X-ray mirrors fabricated by electron-beam evaporation

Mo/Si multilayers are fabricated by electron-beam evaporation in UHV at different temperatures (30° C, 150° C, 200° C) during deposition. After completion their thermal stability is tested by baking them at temperatures (T _bak) between 200° C and 800° C in steps of 50° C or 100° C. After each baking step the multilayers are characterized by small angle Cu_K-X-ray diffraction. Additionally, the normal incidence soft-X-ray reflectivity for wavelengths between 11 nm and 19 nm is determined after baking at 500° C. Furthermore, the layer structure of the multilayers is investigated by means of Rutherford Backscattering Spectroscopy (RBS) and sputter/Auger Electron Spectroscopy (AES) technique. While the reflectivity turns out to be highest for a deposition temperature of 150° C, the thermal stability of the multilayer increases with deposition temperature. The multilayer deposited at 200° C stands even a 20 min 500° C baking without considerable changes in the reflectivity behaviour.     

On Davies’ argument from relational properties

In Art as Performance, David Davies identifies certain properties relevant to artistic appreciation of artworks that, he suggests, are naturally construed as belonging to the artist’s creative performance rather than to any product of that performance (the “work-product”). He further argues, against an anticipated opponent, that such properties cannot be excluded as irrelevant to artistic appreciation in any principled way. I argue that the cited properties can be intelligibly construed as properties of the associated work-product, whether or not they are relevant to artistic appreciation; but that some are not relevant to artistic appreciation. In doing so, I offer a principle determining when a property of an artwork is relevant to artistic appreciation. I conclude that, on its own, Davies’s argument offers no good grounds to abandon our practice of thinking of the artwork as the product of an artist’s activity, rather than the activity itself.     

Photoproton spectrum from carbon with good energy resolution

The 90° photoproton spectrum from¹²C has been measured with good energy resolution using bremsstrahlung with maximum energyEγ=31 MeV. A fragmentation of the giant dipole resonance in fine structures with a typical width of 150 to 300 keV is observed.