Trial production of automatic sweep Fourier transform microwave spectrometer designed for 1GHz region

1GHz区域自动扫频傅里叶变换微波光谱仪的试制

• 批准号: 08640653
• 负责人: ONDA Masao
• 金额: $ 1.28万
• 依托单位: Sophia University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640653/
• 关键词: FT microwave spectrometer; 3GHz region; automatic frequency sweep; Biomolecule-water complex; 2-chlorophenole; (E)-benzaldehydeoxime; 4-fluorobiphenyl; biphenyether; 2GHz領域; 生化学関連分子; 生化学的分子

The purpose of this project is a trial production of a sensitive molecular beam Fourier transfer microwave spectrometer designed for low frequency region. Spectrum in this region is suitable for high resolution spectroscopy of rather large molecule including two or three benzene rings( as a part of many biomolecules).At first, we improved our spectrometer to be change the direction of molecular beam to be parallel that of microwave propagation. This improvement was advised by Grabow (Kiel Uni., Germany) and Lovas (NIST, USA) and we got more sensitivity to previous level.Second step we constructed a Fabry-Perot cavity with two concave mirrors. One mirror fixed to cylinder which moved for and back through a flange hole of vacuum tank for tuning the frequency. It was easy to heat a solid sample like biomolecule. After several trials, we met some serious problems about mirror arrangement and tuning.Now we are trying to design and make a new model ; (1) two precise rails are set up out side of the vacuum tank and attached to both flanges on right angle. (2) two large mirrors (diameter : 550mm) fixed to Flange respectively. (3) we can make a large mirror by special tool on low expense.The electronic parts for frequency auto sweep mechanism were purchased and set up the circuit. A control program was obtained from NIST group and transferred to our system.Our final purpose of this project is to determine a molecular structure of the complex between biomolecule and water for concrete examples are benzoic acid and water, and catechol and water. We have already tried to measure spectrum of these complexes using old FTMW spectrometer, however could not obtain the spectral lines. New technique for a solid sample should be developed, including laser ablation.

该项目的目的是针对低频区域设计的敏感分子束傅立叶传递微波光谱仪的试验生产。该区域中的光谱适用于相当大的分子的高分辨率光谱法，包括两个或三个苯环（作为许多生物分子的一部分）。首先，我们改进了光谱仪，以改变分子束的方向，使其与微波传播的相似。 Grabow（德国Kiel Uni。）和Lovas（美国NIST）建议了这一改进，我们对以前的水平更加敏感。第二步，我们构建了一个带有两个凹面镜的Fabry-Perrot腔。固定在圆柱体上的一面镜子，该圆柱体通过真空罐的法兰孔移动，以调整频率。很容易加热像生物分子这样的实心样品。经过几次试验，我们遇到了一些有关镜像布置和调整的严重问题。现在我们正在尝试设计和制作新模型。 （1）将两个精确的轨道设置在真空水箱的侧面，并以直角连接到两个法兰。 （2）分别固定在法兰上的两个大镜（直径：550mm）。 （3）我们可以通过低支出的特殊工具制作一个大镜子。购买了频率自动扫描机构的电子零件并设置了电路。从NIST组获得了一个控制程序，并转移到我们的系统中。该项目的最终目的是确定生物分子和水之间的复合物的分子结构用于混凝土示例，包括苯甲酸和水，以及儿茶酚和水。我们已经尝试使用旧的FTMW光谱仪测量这些配合物的光谱，但是无法获得光谱线。应开发针对实体样品的新技术，包括激光消融。

项目成果

J.-U.Grabow: "The ^<33>S Nuclear Quadrupole Coupling in the Rotational Spectrum of 2,2-Dimethylthiiran" Z.Naturforsch. 51a. 1110-1112 (1996)

J.-U.Grabow：“2,2-二甲基噻喃旋转光谱中的^<33>S核四极耦合”Z.Naturforsch。

J.-U.Grabow: "The ^<33>S Nuclear Quadrupole Coupling in the Rotational Spectrum of 2, 2- Dimethylthiiran" Z.Naturforsch.51a. 1110-1112 (1996)

J.-U.Grabow：“2, 2-二甲基噻喃旋转光谱中的^ 33 S核四极耦合”Z.Naturforsch.51a。

M.Onda: "The microwave spectrum and structure of the 1,2,3-trifluorobenzene・・・argon complex" J.Mol.Struct.(IN PRESS). (1997)

M.Onda：“1,2,3-三氟苯...氩络合物的微波光谱和结构”J.Mol.Struct.（印刷中）。

M.Onda: "Microwave Spectrum and molecular planarity of acetophenone" J.Mol.Struct.442. 19-22 (1998)

M.Onda：“苯乙酮的微波谱和分子平面性”J.Mol.Struct.442。

M.Onda: "Microwave spectrum and molecular planarity of acetophenone" J.Mol.Struct.(IN PRESS). (1997)

M.Onda：“苯乙酮的微波光谱和分子平面性”J.Mol.Struct.（正在出版）。