Dynamics of Spectroscopic Relaxation Processes in Noise Fields

噪声场中光谱弛豫过程的动力学

基本信息

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

项目摘要

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，并建立理解和描述光谱弛豫现象的通用方法。以自旋1/2系统中的核磁共振瞬态为基础，从随机涨落作为弛豫根源的角度，研究了以下课题：一、通过精密测量和计算机研究噪声特性与弛豫现象之间的关系人工合成噪声场下弛豫现象的模拟，2.阐明基于常规弛豫随机理论的解析处理的局限性，寻找描述广义条件下弛豫现象的方法，3.观察相干瞬态具有任意相关时间的合成噪声光下的光学两能级系统，以及 4. 研究噪声光激发下的弛豫过程。这项工作的结果总结如下 1. 二态型和高斯型通过开发计算机程序来合成具有任意参数的噪声。 2. 在与静磁场平行施加的噪声磁场中精确测量水中质子的核磁共振相干瞬变，其中相敏检测（PSD）信号由于信号的逐次变化而随机化多次对相位进行平均，得到与横向弛豫相对应的衰减曲线。 3.通过改变噪声场的幅度和相关时间，精确测量非均匀磁场下烧孔的形状和宽度，并将结果与布洛赫方程的预测进行比较。 4. 在铷蒸气中进行噪声激发光谱，其中光谱是通过输入噪声光和输出光之间的强度相关性的傅里叶变换获得的。