Gas-phase actinide chemistry studies utilizing Fourier transform ion 气相的锕系元素化学研究利用傅里叶变换离子.pptVIP

Gas-phase actinide chemistry studies utilizing Fourier transform ion 气相的锕系元素化学研究利用傅里叶变换离子.ppt

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Gas-phase actinide chemistry studies utilizing Fourier transform ion 气相的锕系元素化学研究利用傅里叶变换离子

Gas-phase actinide chemistry studies utilizing Fourier transform ion cyclotron resonance mass spectroscopy John Langridge Chem 5460 Dr. Chyan Outline I. A generalized view of Mass Spectroscopy II. Fundamentals of FTICR-MS III. Why gas phase? IV. Actinide studies – application Why study Actinides? Reactivity Kinetics and Reaction efficiencies Thermodynamics Ionization and bond energy I. A generalized view of Mass Spectroscopy II. Fundamentals of FTICR-MS Fundamentals of FTICR-MS Functions of ion mass Radius Velocity Energy Ion cyclotron frequency A. Marshall, et al., Mass Spectrometry Reviews 17 (1998), 1. Fundamentals of FTICR-MS Ion cyclotron resonance (ICR) ICR frequency = fundamental resonant frequency of species Feature: Ions of given m/z are same regardless of velocity When ICR = excitation frequency, cyclotron motion results Cyclotron motion ? high precision m/q without translational energy focusing Factor separating FTICR-MS from other methods A. Marshall, et al., Mass Spectrometry Reviews 17 (1998), 1. Fundamentals of FTICR-MS Fundamentals of FTICR-MS: Components Ion sources External is best Avoids magnetic perturbations Sometimes at cost of ion optics A. Marshall, et al., Mass Spectrometry Reviews 17 (1998), 1. J. K. Gibson, J. Mar?alo, Coord. Chem. Rev. 250 (2006), 776. Fundamentals of FTICR-MS: Components Ion trapping ? E field + H field Trapping alone ? kinetic energy + mass/charge ICR frequency sweep ? orbital transition Collision induced dissociations (CID) of ions with gas Changing system A. Marshall, et al., Mass Spectrometry Reviews 17 (1998), 1. J. K. Gibson, J. Mar?alo, Coord. Chem. Rev. 250 (2006), 776. Fundamentals of FTICR-MS: Components Detection: ion ? time varying AC signal Current ? AC “image” coupling to detector plates analogous to broadcast model Ions are part of the circuit! A. Marshall, et al., Mass Spectrometry Reviews 17 (1998), 1. Fundamentals of FTICR-MS: Components Fourier transformation Time dom

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