Impact of γ-Irradiation on Separation of Nuclear Spin-Relaxation Mechanisms Under Magnetic Saturation in a NaF Crystal

IF 1.1 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Applied Magnetic Resonance Pub Date : 2024-07-05 DOI:10.1007/s00723-024-01675-7

A. M. Rochev, V. M. Mikushev, E. V. Charnaya

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Abstract

Studies were carried out on the effect of additional continuous magnetic saturation of the NMR line on nuclear spin relaxation in a NaF single crystal before and after γ-irradiation. The times of magnetization recovery after inversion were measured at room temperature using a Bruker Avance 400 pulse spectrometer. The magnetic saturation was obtained by exciting a long additional resonance pulse. Two main contributions to relaxation for quadrupole ²³Na nuclei, due to spin-phonon coupling in a regular crystalline lattice and due to magnetic centers, were separated by suppressing the latter contribution. γ-irradiation was shown to enhance spin relaxation, however, the magnetic saturation does not suppress the contribution of color centers. The times corresponding to ²³Na relaxation due to spin-phonon coupling in a regular lattice, due to magnetic centers and color centers were evaluated. It was shown that the rate of spin–lattice relaxation for dipole ¹⁹F nuclei was not affected by magnetic saturation.

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γ-辐照对 NaF 晶体磁饱和状态下核磁自旋共振机制分离的影响

研究了γ-辐照前后 NMR 线附加连续磁饱和对 NaF 单晶核自旋弛豫的影响。使用布鲁克 Avance 400 脉冲光谱仪在室温下测量了反转后磁化恢复的时间。磁饱和是通过激发一个长的附加共振脉冲获得的。四极 23Na 核的弛豫有两个主要贡献，一个是规则晶格中的自旋-声子耦合，另一个是磁中心的贡献。γ-辐照可增强自旋弛豫，但磁饱和并不能抑制色心的贡献。对规则晶格中由于自旋-声子耦合、磁中心和色心引起的 23Na 松弛的相应时间进行了评估。结果表明，偶极 19F 核的自旋-晶格弛豫速率不受磁饱和的影响。

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来源期刊

Applied Magnetic Resonance 物理-光谱学

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

2.3 months

期刊介绍： Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.