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Laser mass spectrometry: I. Laser desorption of single particles. II. Molecular size dependences in single and multiphoton ionization.

机译:激光质谱:I.单个颗粒的激光解吸。二。单光子和多光子电离的分子大小依赖性。

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摘要

n this thesis a new technique is presented which is capable of detecting single, micron-sized particles in an on-line mode. Additionally, molecular size dependences in both primary and secondary fragmentation processes are probed for a series of ;Particles of known size and composition are generated in the laboratory, introduced into the mass spectrometer and detected by monitoring scattered radiation from a helium neon laser. The scattered laser radiation is used to generate a trigger signal which promptly fires an excimer laser for particle desorption/ionization. The excimer laser is operated at 193nm, 248nm or 337 nm at irradiances in the range of 1.0 ;In the second portion, electron impact, single photon and multiphoton ionization data demonstrate molecular size dependences in primary and secondary fragmentation for a series of
机译:在本文中,提出了一种新技术,该技术能够以在线模式检测单个微米大小的颗粒。此外,还针对一系列片段探测了主要和次要碎裂过程中分子大小的依赖性;在实验室中生成了已知大小和组成的颗粒,将其引入质谱仪,并通过监测氦氖激光的散射辐射进行检测。散射的激光辐射用于生成触发信号,该信号立即激发准分子激光器进行粒子解吸/电离。准分子激光器在193nm,248nm或337nm的波长下在1.0的范围内工作;在第二部分中,电子撞击,单光子和多光子电离数据证明了一系列分子的一级和二级碎裂的分子大小依赖性。

著录项

  • 作者

    McKeown, Patrick John.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Chemistry Analytical.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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