Practical Aspects of Ion Trap Mass Spectrometry, Volume 1Raymond E. March, John F.J Todd Fundamentals of Ion Trap Mass Spectrometry presents an account of the development and theory of the quadrupole ion trap and its utilization as an ion storage device, a reactor for ion/molecular reactions, and a mass spectrometer. It also expands the appreciation of ion traps from that of a unique arrangement of electrodes of hyperbolic form (and having a pure quadrupole field) to a series of ion traps having fields with hexapole and octopole components and introduces the practical ion trapping device in which electrode spacing has been increased. The fundamentals of ion trap are covered in four chapters, beginning with the origin of the ion trap, its development and operating principles, and improvements in performance. The second part focuses on the environment within the ion trap -- the movement of ions within the trap -- and how this movement is modified by repeated collisions of the ions with buffer gas atoms of helium, and on the collisions of ions with molecules that lead to chemical change. The critical role of collisions in focusing the ion cloud for subsequent operations is emphasized. This important reference presents a coherent picture of the present status of research in the ion trapping field to facilitate the entree of potential ion trappers and provide a backdrop for ion trap research and development in the future. |
Contents
John F J Todd | 4 |
Atomic clocks 28 | 8 |
Chapter | 9 |
D | 11 |
Introduction 1 | 17 |
Chapter 2 | 25 |
Chapter 3 | 61 |
Backdriving force 63 67 87 103 | 63 |
Commercialization of the Quadrupole Ion Trap | 169 |
Chapter 5 | 209 |
Chapter 6 | 221 |
Chapter 7 | 270 |
Boundary Excitation | 299 |
Chapter 8 | 343 |
| 403 | |
| 411 | |
Common terms and phrases
a₂ amplitude applied B₂ Brodbelt buffer gas collisional cooling collisions decapole detection dimethyl ether dipolar dipole dipole field dissociation effect end-cap electrodes experimental experiments Finnigan fragment ions geometry helium higher hunting oscillation hyperbolic angle increase instrument ion cloud ion ejection Ion Energy ion isolation ion kinetic energy ion motion Ion Processes ion species ion/molecule reactions ionization ions of m/z ITMS lactones m/z ratio mass range mass shift Mass Spectrom Mass Spectrometry Mathieu equation method molecular ion mtorr multipole fields nitrobenzene nonlinear resonance octopole field parameters Paul trap peak phase Phys pole position protonated pseudopotential pure quadrupole field q₂ quadrupole ion trap radial resonance condition Resonance Ejection resonance excitation RF drive RF voltage ring electrode scan function secular frequency secular oscillation shown in Figure simulation space charge spectra ẞ₂ stability diagram storage structure superimposed superposition tickle voltage tion Todd Vedel velocity z-direction