Astronomical soft x-ray mirrors reflectivity enhancement by multilayer coatings with carbon overcoating

Marco Barbera, Negri, Spiga, Vernani, Cotroneo, Varisco, Grisoni, Artale, Collura, Valsecchi, Giovanni Pareschi, Barbera

Risultato della ricerca: Otherpeer review

26 Citazioni (Scopus)

Abstract

A number of X-ray astronomical missions of near future will make use of hard X-ray optics with broad-band multilayercoatings. However multilayer mirrors can be also useful to enhance the effective area of a given X-ray telescope in the"classical" low energy X-ray band (0.1 – 10 keV), the window where X-ray spectroscopy provides very useful plasmadiagnostics) with a consistent gain with respect to usual single-layer reflectors. Multilayers for soft X-rays are based onstacks with constant d-spacing (in order to minimize the loss due to the photoelectric effect). A further gain inreflectivity (however only restricted to the energy range between 0.5 and 4 keV) can be achieved by using a low densitymaterial as a first external layer of the film, with the role of reducing the photoelectric absorption effect when the mirroracts in total external reflection regime (Carbon is the most performing material for this specific scope). In this paper theimpact of using soft X-ray multilayer mirrors in future X-ray telescopes is discussed, and soft X-ray reflectivity testsperformed on prototype samples presented
Lingua originaleEnglish
Pagine481-491
Numero di pagine11
Stato di pubblicazionePublished - 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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