Study of In-Trap Ion Clouds by Ion Trajectory Simulations
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument (China)
- Purdue University, Weldon School of Biomedical Engineering (United States)
- Wuhan University, Department of Physics (China)
Gaussian distribution has been utilized to describe the global number density distribution of ion cloud in the Paul trap, which is known as the thermal equilibrium theory and widely used in theoretical modeling of ion clouds in the ion traps. Using ion trajectory simulations, however, the ion clouds can now also be treated as a dynamic ion flow field and the location-dependent features could now be characterized. This study was carried out to better understand the in-trap ion cloud properties, such as the local particle velocity and temperature. The local ion number densities were found to be heterogeneously distributed in terms of mean and distribution width; the velocity and temperature of the ion flow varied with pressure depending on the flow type of the neutral molecules; and the “quasi-static” equilibrium status can only be achieved after a certain number of collisions, for which the time period is pressure-dependent. This work provides new insights of the ion clouds that are globally stable but subjected to local rf heating and collisional cooling. .
- OSTI ID:
- 22776783
- Journal Information:
- Journal of the American Society for Mass Spectrometry, Vol. 29, Issue 2; Conference: 32. Asilomar conference on novel instrumentation in MS and ion mobility, Pacific Grove, CA (United States), 14-18 Oct 2016; Other Information: Copyright (c) 2018 American Society for Mass Spectrometry; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-0305
- Country of Publication:
- United States
- Language:
- English
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