NEW TECHNIQUES IN ION CYCLOTRON RESONANCE SPECTROMETRY
Abstract
Three new experimental techniques involving ion cyclotron resonance spectrometry are described in this thesis. The first of these, electron impact excitation of ions from organics (EIEIO) involves trapping ions in the space charge potential of an electron beam, where they are excited by electron impact and subsequently undergo dissociation. Spectra obtained by this method for a variety of substituted benzene radical cations are shown to be analogous to those obtained by collision-induced dissociation and yield characteristic structural information. The second technique involves the use of a pulsed laser ionization source in conjunction with ion cyclotron resonance detection. The use of this source to generate and study the gas-phase ion-molecule reaction chemistry of atomic metal ions is considered, along with a discussion of how such metal ions may be useful as new chemical ionization reagents. The third technique involves the use of Fourier transform mass spectrometry to obtain collision-induced dissociation spectra. The fundamental features of this technique are discussed, along with its application to high resolution detection of CID fragments, observation of consecutive CID reactions, and obtaining breakdown curves.
Degree
Ph.D.
Subject Area
Analytical chemistry
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