Contraction of Reflection TOF Mass Spectrometer for Very High Ions

超高离子反射 TOF 质谱仪的收缩

• 批准号: 01840020
• 负责人: SHINOHARA Hisanori
• 金额: $ 6.14万
• 依托单位: Mie University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B).
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01840020/
• 关键词: MPI; Very high mass ions; Reflectron; Time-of-flight; Molecular clusters; Post acceleration; Supersonic nozzle; 飛行時間型質量分析計; イオン反射鏡; 超高質量イオン; パルス分子線; クラスタ-; 多光子イオン化

A reflectron time of flight mass spectrometer has been constructed in order to detect molecular or molecular cluster ions of very high masses. The time-of-flight system is divided by three parts : (1) Supersonic nozzle source ; (2) Laser-ionization region ; (3) Time of flight drift tube and ion det ector. Multiphoton ionization (MPI) has been used in order to obtained high mass resolution and high ionization efficiency.Molecular cluster ions, such as benzene and ammonia clusters, are detected by MPI method using an ArF excimer laser. Benzene clusters as high as 60-mer are detected, which corresponds to mass number 4,800. The detection limit is governed by the multichannel plate detector used and not by the reflectron time of flight mass spectrometer. To actually detect higher masses a conversiondynode type ion detector is necessary. The mass spectral resolution is as high as 2,500 and typically 2,000. The mass resolution is limited by the pulse width of the excimer laser (10 ns). Higher mass resolution will be obtained by using an ionizing laser with shorter pulse width. The present MPI reflectron time-of-flight mass spectrometer system is the first rate in terms of the mass resolution and the ion detection limit in mass axis.

为了探测极高质量的分子或分子团簇离子，我们建立了反射式飞行时间质谱仪。飞行时间系统由三部分组成：(1)超音速喷嘴源；(2)激光电离区；(3)飞行时间漂移管和离子探测器。为了获得高质量分辨率和高电离效率，采用多光子电离(MPI)技术，利用ArF准分子激光器对苯和氨团簇等分子团簇离子进行了探测。检测到高达60聚体的苯团簇，相当于质量数4,800。检出限由所使用的多通道平板检测器决定，而不是由反射飞行时间质谱仪决定。为了实际探测更高的质量，必须使用转换型离子探测器。质谱学分辨率高达2500，通常为2000。质量分辨率受到准分子激光脉冲宽度(10 Ns)的限制。使用较短脉冲宽度的电离激光将获得较高的质量分辨率。目前的MPI反射式飞行时间质谱计系统在质量分辨率和质量轴上的离子检测极限方面是一流的。

项目成果

H. Shinohara: "Photoionization mass spectroscopic studies of ethylene and acetylene clusters" J. Phys. Chem.94. 6718-6723 (1990)

H. Shinohara：“乙烯和乙炔簇的光电离质谱研究”J. Phys。

H.Shinohara: "Photoionization of Ethylene and Acetylene Clusters:Intra-Cluster Excess Energy Dissipation" Journal of Physical Chemistry. (1990)

H.Shinohara：“乙烯和乙炔簇的光离子化：簇内过量能量耗散”物理化学杂志。

正畠 宏祐: "光化学と分光計測:第3講 分子線技術" 分光研究. 39. 187-202 (1990)

Hirosuke Masahata：“光化学和光谱测量：讲座 3：分子束技术”光谱研究 39. 187-202 (1990)。

H.Shinohara: "Photoionization Mass Spectroscopic Studies of Ethylene and Acetylene Clusters" J.Phys.Chem.94. 6718-6723 (1990)

H.Shinohara：“乙烯和乙炔簇的光电离质谱研究”J.Phys.Chem.94。

篠原 久典: "レ-ザ-イオン化・飛行時間型質量方析法による分子クラスタ-の研究" 質量分析. 38. 43-63 (1990)

Hisanori Shinohara：“使用激光电离和飞行时间质谱研究分子簇”质谱 38. 43-63 (1990)。