Magnetic field modulation of the delayed fluorescence yield in the photoionization reaction of N, N, N', N'-tetramethyl-p-phenylenediamine in water
External magnetic field effects on the recombination fluorescence (MARY effect) in the photoionization reaction of N,N,N′,N′-Tetramethyl-p-phenylenediamine (TMPPD) in water and DMSO/water mixture are studied. Relatively large magnetic field effects (MFE), ∼ 2–4%, on the fluorescence yield are observ...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
1999-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X99000318 |
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| Summary: | External magnetic field effects on the recombination fluorescence (MARY effect) in the photoionization
reaction of N,N,N′,N′-Tetramethyl-p-phenylenediamine (TMPPD) in water and DMSO/water mixture
are studied. Relatively large magnetic field effects (MFE), ∼ 2–4%, on the fluorescence yield are observed in
the extremely polar water solvent under magnetic fields as small as 3 mT. Such MFE is hardly expected in
water due to instability and very fast escape of the solvated electron from the solvent cage. Enhancement
in the signal-to-noise ratio and superior time resolution characterizing the technique of field modulation
allowed the detection of a very short lived radical ion pair (about 1 ns). The observed MARY spectra illustrate
that the singlet radical ion pair is more reactive than the triplet one. |
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| ISSN: | 1110-662X |