Two-Dimensional Pulsed TRIPLE at 95 GHz

Epel, Boris; Goldfarb, Daniella

doi:10.1006/jmre.2000.2139

Cited by 28 publications

(24 citation statements)

References 28 publications

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“…The majority of them provides only the relative signs of two hfcc with respect to each other. Most commonly used is the electron-nuclear-nuclear TRIPLE experiment [2,[13][14][15][16]. By this method the correlation between the nuclear transition frequencies of different nuclei is established, which leads to the determination of the relative signs of their hfccs.…”

Section: Introductionmentioning

confidence: 99%

Absolute signs of hyperfine coupling constants as determined by pulse ENDOR of polarized radical pairs

Epel¹,

Niklas²,

Antonkine

et al. 2006

Appl. Magn. Reson.

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A novel method that allows the determination of absolute signs of hyperfine coupling constants in polarized radical pair (RP) pulse electron-nuclear double resonance (ENDOR) spectra is presented. The va¡ mixing time (VMT) ENDOR method used here leads to a separation of ENDOR transitions originating from different electron spin manifolds by employing their dependence on the time-dependent parameters of the pulse sequence. The simple kinetic model of the RP VMT ENDOR experiment shows very good agreement with the experiments performed on the P70+oA] -RP in photosystem I. This method relies on the selective excitation of absorptive or emissive lines of one radical in the RP EPR spectrum and therefore requires high spectral resolution. This condition was fulfilled for the system studied at the low-field edge of the RP EPR spectrum obtained at Q-band. The method presented here has a very high sensitivity and does not require any equipment additional to the one used for RP pulse ENDOR. The VMT ENDOR method offers the possibility for selective suppression of signals from different electron spin manifolds.

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Section: Introductionmentioning

confidence: 99%

Absolute signs of hyperfine coupling constants as determined by pulse ENDOR of polarized radical pairs

Epel¹,

Niklas²,

Antonkine

et al. 2006

Appl. Magn. Reson.

Self Cite

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“…Without any doubt this combination added new quality to these techniques by a strongly increased information content of relaxation measurements (Prisner, 1997) and improved spectral resolution of HF-ENDOR spectroscopy (Mobius, 1993;Epel and Goldfarb, 2000). Applications of these methods in different fields are shown in several contributions to this book.…”

Section: Introductionmentioning

confidence: 96%

Pulsed High-Frequency EPR

Prisner

2004

Very High Frequency (VHF) ESR/EPR

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Abstract:Pulsed high-field I high-frequency EPR offers the possibility to detect coherences and relaxation properties in disordered samples in much detail. The reason is the spectrally resolved G-tensor, which allows to obtain orientation dependent information even in disordered samples, like proteins. The use of the typical pulsed EPR measurements at high magnetic fields will be discussed and application examples will be given.

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“…Both X j and A j,k implicitly depend on the orientation of the molecule in the magnetic field of the spectrometer because the spin Hamiltonian generally is orientation dependent. In this paper, we use a type of 2D EPR spectroscopy known as HYSCORE [7] as a specific example, although the approach is applicable to other types of 2D EPR [8][9][10] or NMR methods. For simplicity, we do not consider relaxation in Eq.…”

Section: Introductionmentioning

confidence: 99%

“…Although the discussion is in the context of HYSCORE spectroscopy, it is directly relevant to other forms of pulsed EPR spectroscopy, for example, 2D TRIPLE [8,9], 2D ENDOR ESEEM correlation spectroscopy [8] or double nuclear coherence transfer (DONUT)-HYSCORE spectroscopy [10]. Catastrophe theory has been used in the theory of nonlinear resonances in molecular spectroscopy (see, e.g.…”

Section: Introductionmentioning

confidence: 99%