A New Technique for Accurate Measurement and Adjustment of the Phase of the Microwave Pulse in Pulsed EPR Spectroscopy

Ohba, Yasunori; Satoh, Rie; Kikuchi, Takemitsu; Yamauchi, Seigo; Iwaizumi, Masamoto

doi:10.1006/jmra.1993.1167

Cited by 8 publications

(3 citation statements)

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“…2D nutation experiments were carried out at 5 K on a pulsed EPR spectrometer of our own design with a two-pulse sequence . The interval between the first and second microwave (MW) pulses and the length of the second MW pulse were set to 250 and 80 ns, respectively.…”

Section: Methodsmentioning

confidence: 99%

First Observation of the Photoexcited Quintet State in Fullerene Linked with Two Nitroxide Radicals

1999

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The bisadduct of fullerene (1) having two nitroxide radicals at the trans-3 position was newly synthesized. The ground and photoexcited states of 1 were studied by continuous-wave and pulsed two-dimensional electron paramagnetic resonance spectroscopy. An exchange interaction between the radicals was evaluated to be much smaller than an isotropic hyperfine splitting, showing a doublet (S = 1/2) character in the ground state. It was found from a 2D nutation spectrum that a photoexcited state has a quintet character (S = 2) which is generated via interactions between photoexcited triplet fullerene (S = 1) and the two nitroxide radicals (S = 1/2).

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Section: Methodsmentioning

confidence: 99%

First Observation of the Photoexcited Quintet State in Fullerene Linked with Two Nitroxide Radicals

1999

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“…31 2D nutation and electron-spin-echo ͑ESE͒ experiments were carried out at 5 K on a pulsed EPR spectrometer of our own design. 32,33 In the 2D nutation experiment the first microwave ͑MW͒ pulse of duration t 1 was applied at d after a laser pulse of the second harmonic ͑532 nm͒ of a Continuum SL I-20 Nd:YAG laser with 20 Hz, where t 1 was incremented in 32 steps of 10 ns. A delay time d was set to 20 ns to minimize effects of electron spin relaxation.…”

Section: Methodsmentioning

confidence: 99%

The structure and electronic state of photoexcited fullerene linked with a nitroxide radical based on an analysis of a two-dimensional electron paramagnetic resonance nutation spectrum

Mizuochi

Ohba

Yamauchi

1999

The Journal of Chemical Physics

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An electron paramagnetic resonance ͑EPR͒ study of 3,4-fulleropyrrolidine-2-spiro-4Ј-͓2Ј,2Ј,6Ј,6Ј-tetramethyl͔piperidine-1Ј-oxyl ͑1͒ was performed on the photoexcited quartet state in toluene glass. The spectrum of the ͉S,M s͘ϭ͉3/2,Ϯ3/2͘⇔͉3/2,Ϯ1/2͘ transitions was observed selectively by using a two-dimensional ͑2D͒ nutation method and analyzed with a spectral simulation in a randomly oriented system. A position of the nitroxide moiety was determined with respect to the zero-field splitting ͑zfs͒ axes of excited triplet fullerene (3 C 60) by taking into account of the dipolar-dipolar interaction between the radical and 3 C 60 , the hyperfine coupling, the anisotropic g-value of the nitroxide radical, and the zfs of the 3 C 60 moiety. It was found that none of the zfs axes of the 3 C 60 moiety coincide with the local C 2 axis of the molecule which is defined by the position of addition. A symmetry of the electronic structure in 3 C 60 is discussed on the basis of the result.

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“…Details of the TREPR measurements have been reported previously. 15 2D nutation experiments were carried out on a pulsed EPR spectrometer of our own design 16,17 by utilizing the electronspin-echo (ESE) technique as illustrated in Figure 1. In the ESE experiment a first microwave (MW) pulse of duration t 1 was applied after a laser pulse of the second harmonics (532 nm) of a Continuum SL I-20 Nd:YAG laser with 20 Hz, where t 1 was incremented in 34 steps of 4 ns.…”

Section: Methodsmentioning

confidence: 99%

A Two-Dimensional EPR Nutation Study on Excited Multiplet States of Fullerene Linked to a Nitroxide Radical

1997

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Photoexcited states of 3,4-fulleropyrrolidine-2-spiro-4‘-[2‘,2‘,6‘,6‘-tetramethyl]piperidine-1‘-oxyl (1) were studied by the two-dimensional (2D) EPR nutation method in toluene glass. 2D nutation spectra were observed by varying a pulse length of the first microwave pulse in the spin echo experiment. Three kinds of nutation frequencies were obtained from analyses of the 2D spectra and assigned to those of the excited quartet and doublet states on the basis of the fictitious spin-1/2 theory. The obtained EPR parameters such as g-values, hyperfine coupling constants, and zero-field splittings were discussed in terms of the spin Hamiltonian for doublet and quartet states.

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A New Technique for Accurate Measurement and Adjustment of the Phase of the Microwave Pulse in Pulsed EPR Spectroscopy

Cited by 8 publications

References 0 publications

First Observation of the Photoexcited Quintet State in Fullerene Linked with Two Nitroxide Radicals

First Observation of the Photoexcited Quintet State in Fullerene Linked with Two Nitroxide Radicals

The structure and electronic state of photoexcited fullerene linked with a nitroxide radical based on an analysis of a two-dimensional electron paramagnetic resonance nutation spectrum

A Two-Dimensional EPR Nutation Study on Excited Multiplet States of Fullerene Linked to a Nitroxide Radical

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