Journal ArticleDOI
Investigation of the lowest triplet state of free base porphin by microwave induced changes in its fluorescence
TLDR
The zero-field splitting of the non-phosphorescent lowest triplet state of free base porphin is measured by observing microwave induced changes in the fluorescence of this molecule as a guest in a Shpolskii-matrix of n -octane at 4.2°K.About:
This article is published in Chemical Physics Letters.The article was published on 1973-08-15. It has received 88 citations till now. The article focuses on the topics: Porphin & Triplet state.read more
Citations
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The electronic structure of the photoexcited triplet state of free-base (tetraphenyl)porphyrin by time-resolved electron-nuclear double resonance and density functional theory.
TL;DR: The theoretical values for H(2)P and H(1)TPP agree with the experimental values in that the presence of the phenyl groups has only a small effect on the unpaired electron spin-density distribution, and the difference in sensitivity of the zero-field splitting parameters and the hyperfine couplings to mesophenyl substitution is discussed.
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Electron spin resonance in zero magnetic field of triplet states of chloroplasts and subchloroplast particles.
TL;DR: Apparently, rupture of the photosynthetic complex of chloroplasts prevents the formation of this triplet, which is formed by an excitation energy transfer from the PS2 units with closed traps to PSI units, and is trapped on a fraction of antenna chlorophyll that after digitonin treatment.
Journal ArticleDOI
Radio Frequency induced magnetic resonance transitions in excited molecular triplet states as detected via optical nuclear polarization
TL;DR: Optical nuclear polarization (ONP) has been used to detect magnetic resonance transitions in the rf region of both the excited and the ground state of aromatic molecules in a crystalline environment as discussed by the authors.
Journal ArticleDOI
Time correlated delayed fluorescence — ODMR. Dynamics of triplet exciton annihilation in anthracene—tetracyanobenzene crystals
TL;DR: In this article, the authors investigated the spin resonance of triplet excitons in crystals of the charge transfer complex anthracene and used delayed fluorescence for optical detection, showing that even at 1.2 K, free triplets are detectable.
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Microwave power dependence of triplet state kinetics as measured with fluorescence detected magnetic resonance in zero field
A.J. Hoff,B. Cornelissen +1 more
TL;DR: The kinetic parameters of a triplet state, viz. populating probabilities and the depopulating rates, can be extracted from fluorescence detected electron spin resonance experiments in zero magnetic field by monitoring the response of the system to a pulse of resonant microwaves (pulse method) or to their being switched on or off (equilibrium method) as mentioned in this paper.
References
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Journal ArticleDOI
The lowest triplet state of Zn porphin
TL;DR: In this article, three pairs of microwave transitions with widths of a few MHz are found, all of them corresponding to a decrease in phosphorescence intensity, corresponding to the Shpolskii effect, and it was further established that by pumping either of these transitions a third one can be detected at the difference frequency, so that the order of the levels must be X>Y>Z (or reverse)
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Optical and Zeeman studies of the first excited singlet state of zinc porphin in a single crystal of n-octane: Evidence for Jahn-Teller instability
TL;DR: In this paper, the absorption and fluorescence spectra of Zn porphin in an n-octane single crystal at 4·2 K are reported in the region between 17 400 and 18 500 cm-1.
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The lowest triplet state of Zn porphin. II. Investigation of its dynamics by microwave induced delayed phosphorescence
Journal Article
[Study of porphin metal complexes by the method of quasi-linear spectra].
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Optically Detected Adiabatic Inversion in Phosphorescent Triplet States and the Measurement of Intramolecular Energy Transfer Processes
TL;DR: The theory and observation of microwave induced population inversion within triplet magnetic sublevels in zero field is presented in this paper, where inversion via adiabatic fast passage can be measured quantitatively by changes in triplet phosphorescence and can be accomplished easily and with microwave field strengths even lower than are required for cw saturation.