Dynamics of Spectroscopic Relaxation Processes in Noise Fields

噪声场中光谱弛豫过程的动力学

• 批准号: 07454095
• 负责人: FUKUDA Yukio
• 金额: $ 4.99万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454095/
• 关键词: Spectroscopic Relaxation; Noise Field; Nuclear Magnetic Resonance; NMR Transients; Transverse Relaxation; Hole Burning; Computer Simulation; ホールバーニング

The aim of this work is to re-examine the fundamental concept of relaxation processes in the coherent spectroscopy and to establish a general method for understanding and describing the spectroscopic relaxation phenomena. Taking NMR transients in the spin 1/2 system, we study the following subjects from the view point of regarding random fluctuations as the origin of the relaxation : I.To examine relation between the characterstics of noises and relaxation phenomena studied by pecise measurements and computer simulation of relaxation phenomena under artificially synthesized noise fields, 2. To clarify the limit of the analytical treatments based on the conventional stochastic theory of relaxation, and to search a method describe relaxation phenomena under generalized conditions, 3. To observe coherent trnsients in a optical two-level system under synthesized noise-lights with arbitrary corelation times, and 4. To investigate the relaxation processes under noise-light excitation.The summary of the results of this work is as follows 1. Two-state type and Gaussian type noises with arbitorary parameters were synthsized by developing a computer program. 2. NMR coherent transients of the protons in water were precisely measured in a noise magnetic field applied parallel to the static magnetic field, where the phase-sensitively-detected (PSD) signals randomized due to the shot-by-shot change of the signal phases were averaged many times to give decay curves corresponding to the transverse relelaxation. 3. The shapes and widths of the holes burnt under an inhomogeneous magnetic field was precisely measured with varying the amplitude and correlation time of the noise field and the results were compared with the prediction of the Bloch equations. 4. A noise excitation spectroscopy was performed in Rb vapor, where the spectra were obtained from the Fourier transform of the intensity correlation between the input noise-light and the output light.

这项工作的目的是重新审视相干光谱中弛豫过程的基本概念，并建立一种理解和描述光谱弛豫现象的一般方法。以自旋1/2系统中的核磁共振瞬变为例，从随机涨落的角度研究了下列问题：1.检验噪声的特性与人工合成噪声场中弛豫现象的计算机模拟所研究的弛豫现象之间的关系；2.澄清基于传统随机弛豫理论的解析处理的局限性，并寻找一种描述广义条件下弛豫现象的方法；3.观察任意相关时间合成噪声光下光学二能级系统中的相干瞬变。4.研究了噪声光激励下的驰豫过程。本文的工作总结如下：1.通过编制计算机程序，合成了具有任意参数的二态型和高斯型噪声。2.在与静磁场平行的噪声磁场中，精确测量了质子在水中的核磁共振相干瞬变，对由于信号相位逐次变化而随机化的相敏检测(PSD)信号进行了多次平均，得到了对应于横向再松弛的衰减曲线。3.通过改变噪声场的幅值和相关时间，精确测量了非均匀磁场下烧孔的形状和宽度，并与Bloch方程的预测结果进行了比较。4.在Rb蒸气中进行了噪声激发光谱，通过对输入噪声光和输出光之间的强度相关进行傅里叶变换，得到了噪声激发光谱。

项目成果

KOHMOTO,Tosiro: "Spectral Hole Burning in NMR : Experimental Test of Relaxation Theories by Using Well-Characterized Noise Fields" J.Luminescence. 64. 51-54 (1995)

KOHMOTO，Tosiro：“NMR 中的光谱空穴燃烧：使用良好表征的噪声场对弛豫理论进行实验测试”J.Luminescent。

河本敏郎: "Spectral Hole Burning in NMR : Experimental Test of Relaxation Theories by Using Well-Characterized Noise Fields" J.Luminescence. 64. 51-54 (1995)

Toshiro Kawamoto：“NMR 中的光谱空穴燃烧：使用良好表征的噪声场对弛豫理论进行实验测试”J.Luminescent 64. 51-54 (1995)

河本敏郎: "Hole Burning in Well-Characterized Noise Fields : Nonadherence to the Bloch Equations" Phys.Rev.B52. 13475-13479 (1995)

Toshiro Kawamoto：“特征明确的噪声场中的烧孔：不遵守布洛赫方程”Phys.Rev.B52 (1995)。

KOHMOTO,Tosiro: "Hole Burning in Well-Characterized Noise Fields : Nonadherence to the Bloch Equations" Phys.Rev.B52. 13475-13479 (1995)

KOHMOTO，Tosiro：“特征明确的噪声场中的烧孔：不遵守布洛赫方程”Phys.Rev.B52。