SiC mirror

Fig. 9.2. Normal incidence reflectivity for various XUV/SXR mirrors. All of the mirrors, except the SiC mirror, are multilayer-coated. The solid lines show the theoretical values and the plots are measured data...

Chemical vapor deposited silicon carbide (CVD-SiC) is the second most ideal material for deflection mirrors used in short wavelength laser system, next only to crystalline diamond. Conventional polishing techniques were found insufficient to produce CVD-SiC mirrors. The conclusions drawn in this study are as follows ... 

Euture appHcations may involve use of SiC as substrates for siHcon chips, making use of the high thermal conductivity of SiC and its close thermal expansion match to siHcon. The low density and high stiffness of siHcon carbides may also result in appHcations in space. One such appHcation is for space-based mirrors, making use of the high degree of surface poHsh possible on dense SiC. 

Data of thermal expansion do not always show a regular positive slope increasing with temperature, as those shown in Fig. 13.3 [57], Look, for example, in Fig. 13.4, at the data for a cold sintered SiC, a material specially suitable for the realization of high-quality mirrors for space astronomy [58],... 

A very clear-cut example for the influence of the electronic factor in supported catalysts, again involving a thin-layer metal type, is represented in Fig. 2. Here the carriers are commercially available samples of doped carborundum (SiC) which by itself is catalytically entirely inactive. In the abscissa of Fig. 2 we have arranged these samples in the order of their conductivity as stated by their manufacturers. The concentration of positive holes increases towards the right and that of the quasi-free electrons towards the left. Grains of these supports approximately 1 mm in size were covered with a thin layer of silver by the usual mirror produc-... 

Focusing the 27th Harmonic Beam Using a SiC/Mg-coated Concave Mirror... 

Fig. 9.7. Focused beam spot size of the 27th harmonic wave as a function of distance from the SiC/Mg multilayer coated concave mirror. The open circles and filled squares correspond to the horizontal and vertical directions respectively. The best-fit curves based on (9.1) are also shown by the solid lines...

In the same way, the 13th harmonic beam at 61 nm was selected by a tin-foil filter and focused by a SiC concave mirror with a focal length of 50 mm. The angle of incidence was set at 7 degrees. Figure 9.9 shows the 1/e2 beam spot size of the 13th beam as a function of distance from the concave mirror. The... 

Finally, it can he added that very thin nickel films are used as seed layers for the growth of fullerenes and of silicon carbide SiC whiskers, and that C/Ni multilayers are used as x-ray mirrors. ... 

Bisbenzylidene-cyclopentanone 1 (1.04 g, 2.0 mmol) was evenly spread on the inner wall of a mirrored Dewar vessel (diameter 14 cm, height 20 cm) with some dichloromethane. After heating to 80 °C for 1 h the crystalline film was irradiated from within for 3-5 h at 30-35 °C with a high-pressure Hg-lamp (Hano-via 450 W) through a benzophenone filter (5% in benzene 5 mm 2 >380 run) and cooling with running water. XH NMR-analysis revealed 400 mg (38%) 3, 275 mg (26%) 2 (structure clarified in Ref. 2), 85 mg (8%) 4 and 190 mg (18%) unreacted 1. The separation of the products by preparative TLC at 200 g SiC>2 used dichloromethane. Recrystallization of the products was performed in 1,2-di-chloroethane, toluene, and methanol, respectively. 

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