The effect of spectral diffusion on the phase coherence of phosphorescent triplet spins

Hof, C.; Schmidt, Jan

doi:10.1080/00268977900101681

Cited by 37 publications

(9 citation statements)

References 21 publications

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“…The dotted trace shows the for an external magnetic field as low as B 0 É 50 G. exact cancellation at B 0 Å 165 G in the high-field approximaDue to Eq. [9], the hyperfine interaction Ĥ HF Å »Ŝ… AÎ tion, while the real maximum mixing of the nuclear spin smoothly increases from second-order interaction at zero functions occurs at B 0 Å 140 G. field to a first-order effect as the magnetic field is increased.…”

Section: Eseem In Low Magnetic Fieldmentioning

confidence: 95%

“…The general case for an arbitrary orientation of the external magnetic field does not lead to simple analytical expressions and is not considered further. Equation [9] clearly shows that »S… is a states. The dotted trace is calculated with the zero-field parameters D and E of the acridine triplet state (D Å 2.22 GHz, E Å 00.26 GHz), while the solid trace corresponds to a smaller E value (D Å 2.22 GHz, E Å 00.026 GHz).…”

Section: Eseem In Low Magnetic Fieldmentioning

confidence: 96%

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Optically Detected Electron Spin Echo Envelope Modulation on a Photoexcited Triplet State in Zero Magnetic Field—A Comparison between the Zero-Field and High-Field Limits

Weis

Möbius

Prisner

1998

Journal of Magnetic Resonance

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Section: Eseem In Low Magnetic Fieldmentioning

confidence: 95%

Section: Eseem In Low Magnetic Fieldmentioning

confidence: 96%

Optically Detected Electron Spin Echo Envelope Modulation on a Photoexcited Triplet State in Zero Magnetic Field—A Comparison between the Zero-Field and High-Field Limits

Weis

Möbius

Prisner

1998

Journal of Magnetic Resonance

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“…Phase coherence of phosphorescent triplet spins depends strongly on the magnetic moments of the nuclei on the guest as well as on the host molecules (van't Hof and Schmidt, 1979). In photo-excited triplet states, the transfer of the electron spin polarization to the nuclear spin system takes place in the order of a few hundred ns (Schmidt et aI., 1992), and the spinspin relaxation is dominated by a fast spin-lattice relaxation induced by a thermally-activated exchange process (van Kooten and Schmidt, 1985).…”

Section: Tripletsmentioning

confidence: 99%

Relaxation Times of Organic Radicals and Transition Metal Ions

Eaton

2002

Distance Measurements in Biological Systems by EPR

152

165

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Abstract:Review of electron spin relaxation times for organic radicals and transition metal ions in magnetically dilute samples. Emphasis is placed on studies that have been performed as a function of temperature and that provide insight into the relaxation processes. INTRODUCTION Scope of this ChapterMost of the methods for determining distances between spins (ch.l) are either experimentally feasible or theoretically applicable for a limited range of electron spin relaxation times. For example, analysis of the dipolar contribution to the CW line shape to determine interspin distance requires that the relaxation rate for the interacting partner is slow enough that the dipolar splitting is not collapsed by electron spin relaxation. In addition, analysis of the line shapes assumes that spectra are obtained under nonsaturating conditions and are free from passage effects. Application of methods based on changes in relaxation times requires that the relaxation rate of the interacting partner fall within certain limits. The longest distance that can be obtained by pulsed techniques is limited, in principle, by the relaxation-determined width of an individual spin packet. Thus, knowledge of electron spin relaxation times is foundational to the methodologies presented in this book.

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“…The triplet levels are inhomogeneously broadened to a width Ll inh = 2n· 13 MHz« WI whereas the homogeneous width is only about Ll hom = 2n· 0.1 MHz [12]. Under these conditions the microwave field is expected to bum a narrow hole in the line.…”

Section: Nuclear Spin-lattice Relaxationmentioning

confidence: 98%

Microwave Induced Optical Nuclear Polarization at 75 GHz: A quantitative analysis

1993

Self Cite

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A quantitative analysis of Microwave Induced Optical Nuclear Polarization (MIONP) on crystals of fluorene-h., doped with phenanthrene-d., at 75 GHz and 1.4 K is presented. Two effects are studied in detail: the nuclear spin diffusion barrier and the phonon bottleneck. Experiments are presented that allow the identification of the proton spins on fluorene-h., molecules located inside the nuclear spin diffusion barrier surrounding phenanthrene-d., molecules excited in the photo-excited triplet state. Using this result the experimental values for the triplet spin-lattice relaxation (SLR) rates and the nuclear SLR rate can be related to each other without any fitting parameter. Microwave frequency and magnetic field modulation are used during MIONP to prove that the triplet SLR is phonon-bottlenecked, Subsequently a quantitative analysis of MIONP in the system fluorene-h., doped with phenanthrene-d., is obtained.

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The effect of spectral diffusion on the phase coherence of phosphorescent triplet spins

Cited by 37 publications

References 21 publications

Optically Detected Electron Spin Echo Envelope Modulation on a Photoexcited Triplet State in Zero Magnetic Field—A Comparison between the Zero-Field and High-Field Limits

Optically Detected Electron Spin Echo Envelope Modulation on a Photoexcited Triplet State in Zero Magnetic Field—A Comparison between the Zero-Field and High-Field Limits

Relaxation Times of Organic Radicals and Transition Metal Ions

Microwave Induced Optical Nuclear Polarization at 75 GHz: A quantitative analysis

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