Spectral Characteristics of EDL

The spectral characteristics of EDL are of general interest in microwave-assisted photochemistry experiments. The right choice of EDL envelope and fill material can be very useful in planning an efficient course of the photochemical process without the need to filter out the undesirable part of the UV radiation by use of other tools, for example glass or solution filters or monochromators [59, 60]. 

Whereas atomic fills usually furnish line emission spectra, molecular fills give continuous emission bands [61], The total emission output of the most common lamp - the mercury EDL (Hg EDL) - in the region 200-600 nm is approximately the same as that of the electrode lamp with the same power input [62], The distribution of the radiation is, however, markedly different, as a result of much higher Hg pressure and the greater number of atoms present in the plasma. EDL emit over three times as much UV and over a half as much IR as a conventional lamp [63]. It has been noted that EDL and electrode lamps provide different spectra when the fill contains a rare-earth material but similar spectra when a non-rare-earth fills are used [64]. Addition of material had very substantial effects on the spectral distributions of EDL [62]. 

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The spectral characteristics of EDL are of a general interest in microwave photochemistry. The right choice of filling material can provide a desirable ultraviolet radiation. Atomic fills usually furnish line emission spectra (e.g. that of an Hg-EDL is... 

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