Spectral output of commercial microwave-driven lamps

Spectral output of commercial microwave-driven lamps. (Courtesy of UV Fusion Systems.) 

The wavelength of the emitted light depends on the choice of atoms A and B. Besides the principle of excimer formation, the technical parameters for the lamp and discharge are responsible for the quasi-monochromatic character of the emitted spectrum. The most important commercial excimers are formed by electronic excitation of molecules of rare gases (He2, Ne2, Ar2, Kr2, Xe2), 

Excimers as radiation sources have the following characteristics  

For industrial applications of excimer UV sources, the dielectric barrier and the microwave discharge are simple, reliable, and efficient excitation modes. There are a large number of vacuum UV (VUV), UV, and visible light transitions available. This allows a selective photoexcitation for many systems. Some sources of monochromatic UV light for industrial applications and their characteristics are in Table 2.1. 

As pointed out in Chapter 1, ionizing radiation includes high-energy electrons (electron beam), y-rays, and x-rays. These not only are capable of converting monomeric and oligomeric liquids into solids, but also can produce major changes in properties of solid polymers. Also, in comparison to UV and visible radiation, they can penetrate considerably deeper into the material. 

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