2005
The Electrodeless Discharge Lamp: A Prospective Tool for Photochemistry Part 5: Fill Material-Dependent Emission Characteristics
MÜLLER, Pavel, Petr KLÁN a Vladimír CÍRKVAZákladní údaje
Originální název
The Electrodeless Discharge Lamp: A Prospective Tool for Photochemistry Part 5: Fill Material-Dependent Emission Characteristics
Název česky
Emisní charakteristiky EDL
Autoři
MÜLLER, Pavel (203 Česká republika), Petr KLÁN (203 Česká republika, garant) a Vladimír CÍRKVA (203 Česká republika)
Vydání
Journal of Photochemistry and Photobiology A: Chemistry, Amsterdam, The Netherlands, Elsevier Science, 2005, 1010-6030
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10401 Organic chemistry
Stát vydavatele
Nizozemské království
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 2.286
Kód RIV
RIV/00216224:14310/05:00012594
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000228150900006
Klíčová slova anglicky
Photochemistry; Microwave; Electrodeless discharge lamp; Emission; Spectra
Příznaky
Mezinárodní význam
Změněno: 23. 6. 2009 15:28, prof. RNDr. Petr Klán, Ph.D.
V originále
This work expands our previous research on an original photochemical reactor consisting of the electrodeless discharge lamp (EDL) inside a reaction mixture that generates ultraviolet radiation in the microwave (MW) field. The effects of temperature MW output power of the reactor, and EDL envelope material, were already published [P. Muller, P. Klan, V. Cirkva, J. Photochem. Photobiol. A: Chem. 158 (2003) 1]. Now we report on the emission characteristics (250-650 nm) of various EDLs containing different fill materials (Hg, HgI2, Cd, I2, KI, P, Se, and S). While distinct line emission peaks were found for mercury, cadmium and phosphorus fills, iodine, selenium and sulfur-containing EDLs emitted continuous bands. Sulfur-containing EDLs are proposed for phototransformations that are of environmental interest due to the emission flux comparable to solar terrestrial radiation. It is concluded that the right choice of EDL envelope fill material can be very useful in planning an efficient course of photochemical process without necessity of filtering off the undesirable part of the UV radiation by other tools, such as glass or solution filters or monochromators. Quantum efficiency measurements of the Norrish type II reaction were accomplished to compare usefulness of the EDLs in photochemical applications. Sulfur and phosphorus-containing EDLs were found as the most efficient sources of UV radiation.
Česky
This work expands our previous research on an original photochemical reactor consisting of the electrodeless discharge lamp (EDL) inside a reaction mixture that generates ultraviolet radiation in the microwave (MW) field. The effects of temperature MW output power of the reactor, and EDL envelope material, were already published [P. Muller, P. Klan, V. Cirkva, J. Photochem. Photobiol. A: Chem. 158 (2003) 1]. Now we report on the emission characteristics (250-650 nm) of various EDLs containing different fill materials (Hg, HgI2, Cd, I2, KI, P, Se, and S). While distinct line emission peaks were found for mercury, cadmium and phosphorus fills, iodine, selenium and sulfur-containing EDLs emitted continuous bands. Sulfur-containing EDLs are proposed for phototransformations that are of environmental interest due to the emission flux comparable to solar terrestrial radiation. It is concluded that the right choice of EDL envelope fill material can be very useful in planning an efficient course of photochemical process without necessity of filtering off the undesirable part of the UV radiation by other tools, such as glass or solution filters or monochromators. Quantum efficiency measurements of the Norrish type II reaction were accomplished to compare usefulness of the EDLs in photochemical applications. Sulfur and phosphorus-containing EDLs were found as the most efficient sources of UV radiation.
Návaznosti
| GA203/02/0879, projekt VaV |
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| MSM0021622413, záměr |
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