Microwave-induced optical nuclear polarization (MI ONP) of benzophenone in dibromodiphenylether

Bachert, Peter; Brunner, H.; Hausser, Karl H.; Colpa, J.P.

doi:10.1016/0301-0104(84)80076-2

Cited by 16 publications

(3 citation statements)

References 17 publications

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“…This triplet spin polarization can be transferred to nearby, coupled nuclear spins through continuous wave (CW) microwave illumination [12,13], via the dynamic nuclear polarization family of methods or by the application of microwave pulses [14]. Even if the triplet state is not highly polarized upon formation, other properties such as a substantial difference in the decay rates of the triplet sublevels to the ground state can lead to spin polarization that can subsequently be transferred to a nuclear spin [15].…”

Section: Introductionmentioning

confidence: 99%

Probing the C ₆₀ triplet state coupling to nuclear spins inside and out

Filidou

Mamone

Simmons

et al. 2013

Phil. Trans. R. Soc. A.

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The photoexcitation of functionalized fullerenes to their paramagnetic triplet electronic state can be studied by pulsed electron paramagnetic resonance (EPR) spectroscopy, whereas the interactions of this state with the surrounding nuclear spins can be observed by a related technique: electron nuclear double resonance (ENDOR). In this study, we present EPR and ENDOR studies on a functionalized exohedral fullerene system, dimethyl[9-hydro (C60-Ih)[5,6]fulleren-1(9 H )-yl]phosphonate (DMHFP), where the triplet electron spin has been used to hyperpolarize, couple and measure two nuclear spins. We go on to discuss the extension of these methods to study a new class of endohedral fullerenes filled with small molecules, such as H 2 @C 60 , and we relate the results to density functional calculations.

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Section: Introductionmentioning

confidence: 99%

Probing the C ₆₀ triplet state coupling to nuclear spins inside and out

Filidou

Mamone

Simmons

et al. 2013

Phil. Trans. R. Soc. A.

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“…following the discovery of CIDNP by Bargon et al [85] and Ward et al [86] and has been developed by many groups in the next decades [84,[87][88][89][90][91].…”

Section: Dissolution-dnp Using Photo-excited Triplet Statesmentioning

confidence: 99%

Hyperpolarization via dissolution dynamic nuclear polarization: new technological and methodological advances

Pinon

Capozzi

Ardenkjær-Larsen

2020

Magn Reson Mater Phy

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Dissolution-DNP is a method to boost liquid-state NMR sensitivity by several orders of magnitude. The technique consists in hyperpolarizing samples by solid-state dynamic nuclear polarization at low temperature and moderate magnetic field, followed by an instantaneous melting and dilution of the sample happening inside the polarizer. Although the technique is well established and the outstanding signal enhancement paved the way towards many applications precluded to conventional NMR, the race to develop new methods allowing higher throughput, faster and higher polarization and longer exploitation of the signal is still vivid. In this work, we review the most recent advances on dissolution-DNP methods trying to overcome the original technique's shortcomings. The review describes some of the new approaches in the field, firstly, in terms of sample formulation and properties, secondly, in terms of instrumentation.

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“…Nuclear spins, in contrast, have weak thermal spin polarization at experimentally accessible conditions, due to its small magnetic moment. Highly polarized electron spin triplets can be used to polarize surrounding nuclear spins, through continuous wave microwave illumination (under processes termed dynamic nuclear polarization) [14,15], or using microwave pulses [16]. Triplet states can also be used to mediate entanglement between mutually-coupled nuclear spins [9], on timescales much faster than their intrinsic dipolar coupling [17].…”

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confidence: 99%

Coherent Storage of Photoexcited Triplet States UsingSi29Nuclear Spins in Silicon

et al. 2012

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Pulsed electron paramagnetic resonance spectroscopy of the photoexcited, metastable triplet state of the oxygen-vacancy center in silicon reveals that the lifetime of the ms=±1 sub-levels differ significantly from that of the ms=0 state. We exploit this significant difference in decay rates to the ground singlet state to achieve nearly ∼100% electron spin polarization within the triplet. We further demonstrate the transfer of a coherent state of the triplet electron spin to, and from, a hyperfine-coupled, nearest-neighbor 29 Si nuclear spin. We measure the coherence time of the 29 Si nuclear spin employed in this operation and find it to be unaffected by the presence of the triplet electron spin and equal to the bulk value measured by nuclear magnetic resonance.PACS numbers: 71.55.Cn, 76.70.Dx, 03.67.Lx Nuclear spins in solids are promising candidates for quantum bits (qubits) as their weak coupling to the environment often leads to very long spin coherence times [1][2][3][4]. However, performing fast manipulation and controlling interaction between nuclear spin qubits is often more challenging than in other, more engineered, quantum systems [5][6][7]. The use of an optically driven mediator spin has been suggested as a way to control coupling between donor electron spins in silicon: the donor spins exhibit weak direct coupling, but mutually couple through the optically excited state of the mediator [8]. Such ideas could similarly be applied to couple nuclear spins, and, if the mediator spin is a photo-excited triplet with a spinzero single ground state, it would have the added advantage that it avoids long-term impact on the nuclear spin coherence [9][10][11].Photoexcited triplets are optically-generated electron spins (S = 1) which often exhibit large (positive or negative) spin polarization, thanks to preferential population of each of the triplet sub-levels following intersystem crossing and/or the differing decay rates of these sublevels to the ground singlet state [12,13]. Nuclear spins, in contrast, have weak thermal spin polarization at experimentally accessible conditions, due to its small magnetic moment. Highly polarized electron spin triplets can be used to polarize surrounding nuclear spins, through continuous wave microwave illumination (under processes termed dynamic nuclear polarization) [14,15], or using microwave pulses [16]. Triplet states can also be used to mediate entanglement between mutually-coupled nuclear spins [9], on timescales much faster than their intrinsic dipolar coupling [17].Oxygen-vacancy (O-V ) complexes can be formed in silicon by electron beam or γ-ray irradiation of oxygen-rich silicon crystals [18,19], and can be excited to the triplet state (termed an SL1 center,) using illumination of above band gap light [20]. Magnetic resonance studies including electron paramagnetic resonance (EPR), electrically or optically detected magnetic resonance, spin dependent recombination and electrically-detected cross relaxation [20][21][22][23][24][25] have revealed that the SL1 has ...

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Microwave-induced optical nuclear polarization (MI ONP) of benzophenone in dibromodiphenylether

Cited by 16 publications

References 17 publications

Probing the C ₆₀ triplet state coupling to nuclear spins inside and out

Probing the C ₆₀ triplet state coupling to nuclear spins inside and out

Hyperpolarization via dissolution dynamic nuclear polarization: new technological and methodological advances

Coherent Storage of Photoexcited Triplet States UsingSi29Nuclear Spins in Silicon

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Microwave-induced optical nuclear polarization (MI ONP) of benzophenone in dibromodiphenylether

Cited by 16 publications

References 17 publications

Probing the C 60 triplet state coupling to nuclear spins inside and out

Probing the C 60 triplet state coupling to nuclear spins inside and out

Hyperpolarization via dissolution dynamic nuclear polarization: new technological and methodological advances

Coherent Storage of Photoexcited Triplet States UsingSi29Nuclear Spins in Silicon

Contact Info

Product

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Probing the C ₆₀ triplet state coupling to nuclear spins inside and out

Probing the C ₆₀ triplet state coupling to nuclear spins inside and out