Development of Local Relaxation Spectroscopy using 2D Correlation Methods

使用二维相关方法开发局部弛豫光谱

• 批准号: 04555213
• 负责人: TANAKA Hajime
• 金额: $ 10.05万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04555213/
• 关键词: FT-IR; Relxation spectroscpy; Two-dimensional Correlation; Local Motion; External Fields; Ferroelectric Liquid Crystal; Infrared Spectroscopy; Molecular Dynamics; 局所緩和; スペクトロスコピー; 空間相関; ポリマーアロイ; 不均一材料; 2次元相関分光; フーリエ変換赤外分光; 誘電緩和; 顕微分光

The dynamic response of a condensed matter to the perturbation due to the external fields directly tells us on the dynamics of the spontaneous fluctuation modes of the system. To study the dynamic properties of a material, the relaxational spectroscopy such as dielectric and viscoelastic spectroscopy has been widely used so far. Such a spectroscopy is to measure the response of the thermodynamically conjugated variable to the external field as a function of its frequency. This type of macroscopic relaxational spectroscopy is a very powerful mean to study the dynamics of a material, however, it does not provide us with microscopic information at the molecular level. To extract the molecular-level information on the relaxation mechanism, we have always needed a physical model which connects the microscopic and macroscopic world.Infrared, Raman, and NMR spectroscopy, on the other hand, gives us direct molecular-level information such as bonding states and local conformation of molecules. … More However, these spectroscopic techniques have not so far been applied to the dynamic relaxational phenomena, and their application has been limited to the study of the static structure.This type of spectroscopy is very sensitive to the local configuration and environment of chemical bonds, since it uses the resonance phenomena of local structural units. Thus, the dynamic relaxational spectroscopy based on the above spectroscopic techniques should be the ultimate relaxational spectroscopy which directly gives the information on the relaxational behavior of the molecular-level structural units. By studying the dynamic response of each structural units to the perturbation due to an external field, we can elucidate the relaxational mechanism on the molecular level.Along this idea, we have developed a new type of 2D-FTIR relaxational spectroscopy on the basis of the step-scan-type interferometer. 2D-FTIR whose basic principale has been developed by Noda has further been advanced to have ability of studying the frequency dependence of a 2D correlation IR spectrum. The relaxational Phenomena in a linear regime have been successfully measured as a function of the frequency of the external field. The time-resolved infrared spectroscopy was developed by many researchers, however, its application has up to now been limited to the nonlinear switching phenomena of ferroelectric materials, primarily because of the rather poor S/N ratio. We believe that our 3D-FTIR spectroscopy is the first to provide us with a true relaxational spectroscopy withe the molecular-level information in a linear-response-regime. Less

凝聚态物质对外场扰动的动力学响应直接告诉我们系统的自发涨落模的动力学。为了研究材料的动力学性质，弛豫谱（如介电谱和粘弹性谱）已被广泛应用。这样的光谱学是为了测量作为其频率的函数的共轭变量对外部场的响应。这种类型的宏观弛豫光谱是一个非常强大的手段来研究材料的动力学，然而，它并没有为我们提供微观信息，在分子水平上。为了提取弛豫机制的分子水平信息，我们一直需要一个连接微观和宏观世界的物理模型，而红外、拉曼和核磁共振光谱则为我们提供了直接的分子水平信息，例如分子的成键状态和局部构象。 ...更多信息 然而，这些光谱技术迄今为止还没有应用到动态弛豫现象的研究中，它们的应用仅限于静态结构的研究，这类光谱技术由于利用了局部结构单元的共振现象，对化学键的局部构型和环境非常敏感。因此，基于上述光谱技术的动态弛豫光谱应该是直接给出分子水平结构单元弛豫行为信息的最终弛豫光谱。沿着这一思路，我们发展了一种新型的基于步进扫描干涉仪的2D-FTIR弛豫光谱技术。二维傅里叶变换红外光谱仪（2D-FTIR）的基本原理是由Noda等人发展而来的，它具有研究二维相关红外光谱的频率依赖性的能力。在线性范围内的弛豫现象已被成功地测量为外场频率的函数。时间分辨红外光谱技术是近年来发展起来的一种新技术，但由于信噪比低，其应用一直局限于铁电材料的非线性开关现象。我们相信，我们的3D-FTIR光谱是第一个为我们提供真正的弛豫光谱与分子水平的信息在线性响应制度。少

项目成果

Hajime Tanaka: "Critical Anomaly of Complex Shear Modulus in Polymer Solutions:Viscoelastic Suppression of Order Parameter Fluctuation due to Dynamic Asymmetry" Phys.Rev.Lett.71. 2244-2247 (1993)

Hajime Tanaka：“聚合物溶液中复杂剪切模量的临界异常：动态不对称导致的有序参数波动的粘弹性抑制”Phys.Rev.Lett.71。

Jun Yamamoto and Hajime Tanaka: "Shear Effects on Layr Undulation Fluctuations of Hyper-Swollen Lamellar Phase." Phys.Rev.Lett.73 in press. (1995)

Jun Yamamoto 和 Hajime Tanaka：“剪切对超膨胀层状相层状波动的影响。”

Hajime Tanaka,Toshikazu Fujioka,Toshio Nishi.: "A New Methods for Direct Determination of the Time Sequence of Nucleation from Spatial Pattern Divided by Spherulites:" Jpn.J.Appl.Phys,. 30,7B,. L1310-L1313, (1991)

Hajime Tanaka、Toshikazu Fujioka、Toshio Nishi.：“根据球晶划分的空间模式直接确定成核时间序列的新方法：”Jpn.J.Appl.Phys，。

Hajime Tanaka and Tsuyoshi Sonehara: "A New Method of Superheterodyne Light Beating Spectroscopy for Brillouin Scattering Using Frequency-Tunable Lasers." Phys.Rev.Lett.73. 1609-1613 (1995)

Hajime Tanaka 和 Tsuyoshi Sonehara：“使用频率可调谐激光器进行布里渊散射的超外差光拍光谱新方法。”

Hajime Tanaka: "Pattern Formation Caused by Double Quenches in Binary Polymer Mixtures:Response of Phase-Separated Structure to a Second Quench within a Two-Phase Region" Phys.Rev.E. 47. 2946-2949 (1993)

Hajime Tanaka：“二元聚合物混合物中双重淬火引起的图案形成：相分离结构对两相区域内第二次淬火的响应”Phys.Rev.E。