The planetary extreme ultraviolet spectrometer (PLUS) is a project funded by the Italian Space Agency focused on the development of an extreme (EUV) and far-ultraviolet (FUV) high-performance spectrograph, which adopts a dual channel optical scheme. Thanks to an optimized layout based on the use of variable line space (VLS) gratings in an off-Rowland configuration, high spectral and spatial resolution are achieved. The efficiency improvement is obtained by the optimization of the coatings on the optical components. Improved detection limit, shorter observations integration time and unprecedented performance in terms of dynamic range will be achieved by the use of high resolution/dynamic range solar blind photon counting detectors. The photon counting detectors will be based on a micro-channel plate (MCP) coupled with an application specific integrated circuit (ASIC) read out system.
Spectroscopic observations in the vacuum (VUV, 115-200 nm) and extreme ultraviolet (EUV, 40-115 nm) is of fundamental importance in solar physics, in the physics of interstellar medium, in the study of planetary exospheres. The PLUS project is focused on the development of a high performance spectrograph for the observations of planetary exospheres in the 55-200 nm range. The instrument layout is based on a two channels (VUV/EUV) design. It will be characterized by improved detection limit, shorter observations integration time and unprecedented performance in terms of dynamic range. Such characteristics will be obtained thanks to the development and combination of two key technologies: high efficiency optical components optimized for each channel and high resolution/dynamic range solar blind photon counting detector. The photon counting detector will be based on a Micro-Channel Plate coupled with ROIC ASIC read out system.
In this work novel 5,10,15,20 meso-tetraphenyl porphyrin (H2TPP) films have been deposited by means of a new
physical technique named glow discharge induced sublimation (GDS). A preliminary characterization has been
performed by means of scanning electron microscopy (SEM) and Fourier transform infra-red (FT-IR) analyses. SEM
images and infra-red analyses highlight the great surface roughness and the high purity of GDS films, respectively. For
comparison, H2TPP films have been also deposited by means of spin coating (SPIN) technique. Optical sensing
measurements, performed in differently concentrated ethyl alcohol (EtOH) atmospheres, highlight that GDS samples
yield higher response intensities than SPIN films, very short response times and complete recovery.
A novel soluble phthalocyanine compound, i.e zinc phthalocyanine (sulfonamide) has been synthesized by chemical
substitution of zinc phthalocyanine and used to produce thin solid films by means of the spin coating technique.
The chemical structure of the spin coated films has been investigated by FT-IR analysis. Atomic Force Microscopy
(AFM) has been used to characterize the film morphology and to measure the film thickness.
The spin coated films have been tested as optical sensing materials of volatile organic compounds such as methanol,
ethanol and 2-propanol. The change of optical reflectance of the films upon exposure to alcohol-vapour-containing
atmospheres has been measured versus alcohol concentration and exposure time. The films exhibit a fast and
reproducible response, with a complete and fast recovery in methanol and ethanol-containing atmospheres, while diffusion-driven effects appear during exposure to 2-propanol. The response and sensitivity of the films to ethanol vapour is higher than to methanol and 2-propanol.
Experimental results on the realization of Mo/Si multilayer mirrors for EUV applications are presented. The multilayers have been deposited using RF-magnetron sputtering. The characterization of single layers and multilayers has been performed using different physical techniques. The reflectivity of multilayer mirrors optimised for 13 and 19 nm radiation has been measured and compared to simulation.
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