当前位置: X-MOL 学术Appl. Phys. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Detection of narrow lines in the inhomogeneously broadened line of P1 centers in diamond by double modulation EPR spectroscopy
Applied Physics Letters ( IF 3.5 ) Pub Date : 2020-10-12 , DOI: 10.1063/5.0025833
B. Rakvin 1 , D. Carić 1 , M. Kveder 1
Affiliation  

The study of double modulation continuous wave (CW) electron spin resonance (DM-EPR) is reported to detect narrow “spin-packet”-like lines within an inhomogeneous CW-EPR line of low concentration P1 (Ns0) centers ([Ns0] < 1 ppm) in diamond. These narrow lines appear as peaks at multiples of modulation frequency in the double modulation spectrum. It is shown that the respective line shape can be fitted assuming two Lorentzian line shapes. The linewidth of the narrower Lorentzian is comparable with the linewidth of the Lorentzian obtained from the T 2 relaxation time δ 1 = 1 / π T 2 estimated from the Hahn echo pulsed-EPR experiment. The broader component δ 2 correlates with the T 2 * relaxation time obtained from the free induction decay measurement of the inhomogeneous spectral line shape of the P1 center. The ratio δ 2 / δ 1 ∼ 18 derived from DM-EPR measurements approaches within the experimental error the value T 2 / T 2 * ∼ 16 derived from pulsed-EPR. Sensitivity to the small shift of the magnetic field ( ∼ 0.6 μT) was shown to be detectable from the broadening behavior of the δ 2 component. The results promote DM-EPR as a method complementary to pulsed-EPR for studying coherence times of low density paramagnetic centers in a diamond lattice like nitrogen-vacancy (NV−) center, since it exhibits similar properties to the here investigated P1 center in terms of long relaxation time at a monitored low concentration.

中文翻译:

用双调制 EPR 光谱检测金刚石 P1 中心不均匀加宽线中的窄线

据报道,双调制连续波 (CW) 电子自旋共振 (DM-EPR) 的研究在低浓度 P1 (Ns0) 中心 ([Ns0] < 1 ppm)在金刚石中。这些窄线在双调制频谱中表现为调制频率倍数处的峰值。结果表明,可以假设两个洛伦兹线形状来拟合相应的线形。较窄洛伦兹的线宽与从哈恩回波脉冲 EPR 实验估计的 T 2 弛豫时间 δ 1 = 1 / π T 2 获得的洛伦兹线宽相当。较宽的分量 δ 2 与从 P1 中心的非均匀谱线形状的自由感应衰减测量中获得的 T 2 * 弛豫时间相关。从 DM-EPR 测量得出的比率 δ 2 / δ 1 ∼ 18 在实验误差范围内接近于从脉冲 EPR 得出的值 T 2 / T 2 * ∼ 16。从 δ 2 分量的展宽行为中可以检测到对磁场小位移(~0.6 μT)的敏感性。结果促进了 DM-EPR 作为脉冲 EPR 的补充方法,用于研究金刚石晶格(如氮空位 (NV-) 中心)中低密度顺磁中心的相干时间,因为它表现出与此处研究的 P1 中心相似的特性在监测的低浓度下的长弛豫时间。6 μT) 显示可从 δ 2 分量的展宽行为中检测到。结果促进了 DM-EPR 作为脉冲 EPR 的补充方法,用于研究金刚石晶格(如氮空位 (NV-) 中心)中低密度顺磁中心的相干时间,因为它表现出与此处研究的 P1 中心相似的特性在监测的低浓度下的长弛豫时间。6 μT) 显示可从 δ 2 分量的展宽行为中检测到。结果促进了 DM-EPR 作为脉冲 EPR 的补充方法,用于研究金刚石晶格(如氮空位 (NV-) 中心)中低密度顺磁中心的相干时间,因为它表现出与此处研究的 P1 中心相似的特性在监测的低浓度下长弛豫时间。
更新日期:2020-10-12
down
wechat
bug