The Electrodeless Discharge Lamp: A Prospective Tool for Photochemistry Part 5: Fill Material-Dependent Emission Characteristics

MÜLLER, Pavel, Petr KLÁN and Vladimír CÍRKVA. The Electrodeless Discharge Lamp: A Prospective Tool for Photochemistry Part 5: Fill Material-Dependent Emission Characteristics. Journal of Photochemistry and Photobiology A: Chemistry. Amsterdam, The Netherlands: Elsevier Science, 2005, vol. 171, No 1, p. 51-57. ISSN 1010-6030.

Basic information

• Original name: The Electrodeless Discharge Lamp: A Prospective Tool for Photochemistry Part 5: Fill Material-Dependent Emission Characteristics
• Name in Czech: Emisní charakteristiky EDL
• Authors: MÜLLER, Pavel (203 Czech Republic), Petr KLÁN (203 Czech Republic, guarantor) and Vladimír CÍRKVA (203 Czech Republic).
• Edition: Journal of Photochemistry and Photobiology A: Chemistry, Amsterdam, The Netherlands, Elsevier Science, 2005, 1010-6030.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10401 Organic chemistry
• Country of publisher: Netherlands
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 2.286
• RIV identification code: RIV/00216224:14310/05:00012594
• Organization unit: Faculty of Science
• UT WoS: 000228150900006
• Keywords in English: Photochemistry; Microwave; Electrodeless discharge lamp; Emission; Spectra
• Tags: Electrodeless Discharge Lamp, emission, microwave, Photochemistry, Spectra
• Tags: International impact

Abstract

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.

Abstract (in Czech)

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.

Links

• GA203/02/0879, research and development project: Name: Vliv mikrovlnného záření na fotochemické reakce

Investor: Czech Science Foundation, Microwave Irradiation Effect on Photochemical Reactions

• MSM0021622413, plan (intention): Name: Proteiny v metabolismu a při interakci organismů s prostředím

Investor: Ministry of Education, Youth and Sports of the CR, Proteins in metabolism and interaction of organisms with the environment