Quantum beats of the radical pair state in photosynthetic models observed by transient electron paramagnetic resonance

K. Laukenmann; S. Weber; G. Kothe; C. Oesterle; A. Angerhofer; M. R. Wasielewski; W. A. Svec; J. R. Norris

doi:10.1021/j100012a064

Quantum beats of the radical pair state in photosynthetic models observed by transient electron paramagnetic resonance

K. Laukenmann^*, S. Weber, G. Kothe, C. Oesterle, A. Angerhofer, M. R. Wasielewski, W. A. Svec, J. R. Norris

^*Corresponding author for this work

Chemistry

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20 Scopus citations

Abstract

Time-resolved electron paramagnetic resonance (EPR) is used to study the transient spin polarization behavior of the light-induced radical pair state in the photosynthetic model system 2-tetraalkylphenylenediamine-Zn porphyrin-2-naphthoquinone. The time evolution of the transverse magnetization is monitored at various static magnetic fields. This implies a two-dimensional variation of the signal intensity with respect to both the magnetic field and time axis. Zero quantum coherence between two of the four eigenstates of the radical pair is observed at early times after the laser pulse. The beat frequencies vary significantly with the static magnetic field and extend up to 70 MHz. This model system is the first example where quantum beats have been observed of a correlated radical pair with protonated constituents.

Original language	English (US)
Pages (from-to)	4324-4329
Number of pages	6
Journal	Journal of Physical Chemistry
Volume	99
Issue number	12
DOIs	https://doi.org/10.1021/j100012a064
State	Published - Jan 1 1995

ASJC Scopus subject areas

General Engineering
Physical and Theoretical Chemistry

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10.1021/j100012a064

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title = "Quantum beats of the radical pair state in photosynthetic models observed by transient electron paramagnetic resonance",

abstract = "Time-resolved electron paramagnetic resonance (EPR) is used to study the transient spin polarization behavior of the light-induced radical pair state in the photosynthetic model system 2-tetraalkylphenylenediamine-Zn porphyrin-2-naphthoquinone. The time evolution of the transverse magnetization is monitored at various static magnetic fields. This implies a two-dimensional variation of the signal intensity with respect to both the magnetic field and time axis. Zero quantum coherence between two of the four eigenstates of the radical pair is observed at early times after the laser pulse. The beat frequencies vary significantly with the static magnetic field and extend up to 70 MHz. This model system is the first example where quantum beats have been observed of a correlated radical pair with protonated constituents.",

author = "K. Laukenmann and S. Weber and G. Kothe and C. Oesterle and A. Angerhofer and Wasielewski, {M. R.} and Svec, {W. A.} and Norris, {J. R.}",

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T1 - Quantum beats of the radical pair state in photosynthetic models observed by transient electron paramagnetic resonance

AU - Laukenmann, K.

AU - Weber, S.

AU - Kothe, G.

AU - Oesterle, C.

AU - Angerhofer, A.

AU - Wasielewski, M. R.

AU - Svec, W. A.

AU - Norris, J. R.

PY - 1995/1/1

Y1 - 1995/1/1

N2 - Time-resolved electron paramagnetic resonance (EPR) is used to study the transient spin polarization behavior of the light-induced radical pair state in the photosynthetic model system 2-tetraalkylphenylenediamine-Zn porphyrin-2-naphthoquinone. The time evolution of the transverse magnetization is monitored at various static magnetic fields. This implies a two-dimensional variation of the signal intensity with respect to both the magnetic field and time axis. Zero quantum coherence between two of the four eigenstates of the radical pair is observed at early times after the laser pulse. The beat frequencies vary significantly with the static magnetic field and extend up to 70 MHz. This model system is the first example where quantum beats have been observed of a correlated radical pair with protonated constituents.

AB - Time-resolved electron paramagnetic resonance (EPR) is used to study the transient spin polarization behavior of the light-induced radical pair state in the photosynthetic model system 2-tetraalkylphenylenediamine-Zn porphyrin-2-naphthoquinone. The time evolution of the transverse magnetization is monitored at various static magnetic fields. This implies a two-dimensional variation of the signal intensity with respect to both the magnetic field and time axis. Zero quantum coherence between two of the four eigenstates of the radical pair is observed at early times after the laser pulse. The beat frequencies vary significantly with the static magnetic field and extend up to 70 MHz. This model system is the first example where quantum beats have been observed of a correlated radical pair with protonated constituents.

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Quantum beats of the radical pair state in photosynthetic models observed by transient electron paramagnetic resonance

Abstract

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