Magic Angle Spinning Effects on Longitudinal NMR Relaxation: 15N in L-Histidine

• URL: http://arxiv.org/abs/2310.03029v3
• Date: Fri, 3 Nov 2023 10:40:40 GMT
• Title: Magic Angle Spinning Effects on Longitudinal NMR Relaxation: 15N in L-Histidine
• Authors: Armin Afrough, Nichlas Vous Christensen, Rune Wittendorff M{\o}nster Jensen, Dennis Wilkens Juhl, and Thomas Vosegaard
• Abstract summary: Longitudinal relaxation is a mechanism that returns longitudinal nuclear magnetization to its thermal equilibrium by incoherent processes. This work demonstrates the effect of magic angle spinning rate on the longitudinal relaxation rate constant in two model compounds.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Solid-state magnetic resonance is a unique technique that can reveal the dynamics of complex biological systems with atomic resolution. Longitudinal relaxation is a mechanism that returns longitudinal nuclear magnetization to its thermal equilibrium by incoherent processes. The measured longitudinal relaxation rate constant however represents the combination of both incoherent and coherent contributions to the change of nuclear magnetization. This work demonstrates the effect of magic angle spinning rate on the longitudinal relaxation rate constant in two model compounds: L-histidine hydrochloride monohydrate and glycine serving as proxies for isotopically-enriched biological materials. Most notably, it is demonstrated that the longitudinal 15N relaxation of the two nitrogen nuclei in the imidazole ring in histidine is reduced by almost three orders of magnitude at the condition of rotational resonance with the amine, while the amine relaxation rate constant is increased at these conditions. The observed phenomenon may have radical implications for the solid-state magnetic resonance in biophysics and materials, especially in the proper measurement of dynamics and as a selective serial transfer step in dynamic nuclear polarization.

Related papers

• Fourth-order quantum master equations reveal that spin-phonon decoherence undercuts long magnetization relaxation times in single-molecule magnets [55.2480439325792]
  We numerically implement fourth-order quantum master equations to account for coherence terms and describe the full effect of up to two-phonon processes on spin dynamics.<n>We show that while strong axial magnetic anisotropy ensures slow magnetic relaxation approaching seconds at 77 K, the superposition of Kramers doublets is coherent for less than 10 ns due to a novel two-phonon pure dephasing mechanism.
  arXiv  Detail & Related papers  (2025-07-28T11:13:33Z)
• Magnetoreception in cryptochrome enabled by one-dimensional radical motion [0.0]
  A popular hypothesis ascribes magnetoreception to a magnetosensitive recombination reaction of a pair of radicals in protein cryptochrome. Here, we set out to elucidate if a radical pair allowed to undergo internal motion can yield enhanced magneto-sensitivity. Our results highlight the importance of the dynamic environment entwined with the radical pair and ensuing magnetosensitivity under strong EED coupling.
  arXiv  Detail & Related papers  (2023-03-20T13:25:23Z)
• Spin-phonon decoherence in solid-state paramagnetic defects from first principles [79.4957965474334]
  Paramagnetic defects in diamond and hexagonal boron nitride possess a unique combination of spin and optical properties that make them solid-state qubits. Despite the coherence of these spin qubits being critically limited by spin-phonon relaxation, a full understanding of this process is not yet available. We demonstrate that low-frequency two-phonon modulations of the zero-field splitting are responsible for spin relaxation and decoherence.
  arXiv  Detail & Related papers  (2022-12-22T13:48:05Z)
• Optical protection of alkali-metal atoms from spin relaxation [4.010208637548414]
  We present an optical technique for suppressing relaxation in alkali-metal spins using a single off-resonant laser beam.<n>We experimentally demonstrate up to a ninefold reduction in decoherence of warm cesium vapor, achieving simultaneous protection from both spin-exchange relaxation and partial depolarization from coated cell walls.
  arXiv  Detail & Related papers  (2022-09-26T01:19:29Z)
• Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor [62.997667081978825]
  We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal. We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder. Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
  arXiv  Detail & Related papers  (2022-07-21T18:00:17Z)
• Controllable nonreciprocal optical response and handedness-switching in magnetized spin orbit coupled graphene [0.0]
  We calculate the dynamical optical conductivity and permittivity tensor of a magnetized graphene layer with Rashba spin orbit coupling (SOC) Our results reveal a transverse Hall conductivity correlated with the usual nonreciprocal longitudinal conductivity. It is found that the magnetized spin orbit coupled graphene supports strong handedness-switchings, effectively controlled by varying the chemical potential and magnetization strength with respect to the SOC strength.
  arXiv  Detail & Related papers  (2022-01-05T19:00:02Z)
• Cavity-Altered Thermal Isomerization Rates and Dynamical Resonant Localization in Vibro-Polaritonic Chemistry [0.0]
  Reaction rates for molecules embedded in microfluidic optical cavities are altered when compared to rates observed under "ordinary" reaction conditions. We study how strong coupling of an optical cavity mode to molecular vibrations affect the reactivity and how resonance behavior emerges.
  arXiv  Detail & Related papers  (2021-09-28T09:06:08Z)
• Anisotropic electron-nuclear interactions in a rotating quantum spin bath [55.41644538483948]
  Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance. We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system. Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
  arXiv  Detail & Related papers  (2021-05-16T06:15:00Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)
• Dynamical Strengthening of Covalent and Non-Covalent Molecular Interactions by Nuclear Quantum Effects at Finite Temperature [58.999762016297865]
  Nuclear quantum effects (NQE) tend to generate delocalized molecular dynamics. NQE often enhance electronic interactions and, in turn, can result in dynamical molecular stabilization at finite temperature. Our findings yield new insights into the versatile role of nuclear quantum fluctuations in molecules and materials.
  arXiv  Detail & Related papers  (2020-06-18T14:30:29Z)
• Optically pumped spin polarization as a probe of many-body thermalization [50.591267188664666]
  We study the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers. We find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength. Our results open intriguing opportunities to study the onset of thermalization in a system by controlling the internal interactions within the bath.
  arXiv  Detail & Related papers  (2020-05-01T23:16:33Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.