Ion Structure and Energetics in the Gas Phase Characterized Using Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Ion Structure and Energetics in the Gas Phase Characterized Using Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Chad A. Jones Department of Chemistry and Biochemistry, BYU Doctor of Philosophy In this dissertation, I use Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) to study the structure and energetics of gas phase ions. Infrared multiphoton dissociation spectroscopy (IRMPD) is a technique for measuring the IR spectrum of gas phase ions in a Penning trap. I use this technique to investigate the conformation of cucurbituril complexes, terminal diamines, and protonated amino acids. Cross sectional areas by Fourier transform ion cyclotron resonance mass spectrometry (CRAFTI) is a technique developed by the Dearden lab to measure the cross section of gas phase ions. In this work, I further develop a fundamental understanding of this technique. I investigate the role that dissociation plays in this and other FTICR-MS techniques. I also show that the principles of the CRAFTI technique can be used to measure the pressure inside the cell of an FTICR-MS. This technique, linewidth pressure measurement (LIPS), allows for a quantitative measurement and comparison of CRAFTI cross sections. To demonstrate the improvements to the technique, I measure the CRAFTI cross sections for the 20 standard amino acids and compare these to literature values measured by ion mobility measurements.