Development of a Liquid Beam Technique for Characterization of Solute Molecules in Solution.

用于表征溶液中溶质分子的液体束技术的开发。

基本信息

批准号：
03554016
负责人：
KONDOW Tamotsu
金额：
$ 11.01万
依托单位：
The 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：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

High sensitive detection and characterization of solute molecules in solutions were developed. This technique consists of a continuous liquid flow (liquid beam) and multiphoton ionization mass spectrometry. Several aromatic molecules dissolved in methanol, ethanol and water were tested in order to examine the performance of this technique.The liquid beam was prepared by injecting a solution into a vacuum chamber through a 20 mum aperture. The pressure at the chamber was able to be maintained at 10^<-5>-10^<-6> Torr when the beam was injected. A laser beam with a wave length of about 270 nm was allowed to cross the liquid beam, and the photoions produced in the beam were ejected into vacuum as a result of Coulomb explosion. The mass resolution was attained to be about 300 by using pulse acceleration of the photoions.A variety of results were obtained: In the photoionization of an aniline-ethanol solution, for example, the aniline solute molecule is ionized via a resonant two-photon process in the solution and is ejected out of the liquid beam by Coulomb explosion. In addition, the aniline molecules tend to be associated with increasing the aniline concentration. In the case of a surfactant solution, such as an aqueous solution of N-dodencyl pyridinium, hydrocarbons fragmented from the hydrocarbon chain of the surfactant were observed. This result indicates that the surfactant is placed on the liquid surface with its hydrocarbon chain outside. In order to maximize the sensitivity limit, a method of expelling the photoions from the liquid beam will be developed.

开发了溶液中溶质分子的高敏感检测和表征。该技术由连续的液体流动（液体束）和多光子电离质谱法组成。为了检查该技术的性能，测试了溶解在甲醇，乙醇和水中的几种芳族分子。通过将溶液通过20个妈妈的孔注射到真空室中，制备了液体束。注射梁时，腔室的压力能够保持在10^<-5> -10^<-6> Torr。使波长约270 nm的激光束被允许穿过液体梁，并由于库仑爆炸而将光束中产生的照片驱逐到真空中。通过使用照片的脉冲加速度，获得了质量分辨率约为300。获得了各种结果：在光电离等苯胺 - 乙醇溶液中，例如，苯胺溶质分子通过溶液中的谐振剂两光过程电离，并被库仑爆炸中的液体束从液体中弹出。另外，苯胺分子倾向于与苯胺浓度升高有关。在表面活性剂溶液的情况下，例如，观察到从表面活性剂的碳氢化合物链中碎片的碳纤维溶液。该结果表明表面活性剂被放置在液态表面，其外部烃链。为了最大程度地提高灵敏度极限，将开发出一种从液体梁中驱除照片的方法。