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Your search keyword '"Walsh, Noelle"' showing total 2 results
Start Over Author "Walsh, Noelle" Topic mass spectrometry
2 results on '"Walsh, Noelle"'

1. Trap-based Cluster Research and Cluster-based Investigations of Ion Storage at ClusterTrap.

Author

Schweikhard, Lutz, Breitenfeldt, Martin, Herlert, Alexander, Martinez, Franklin, Marx, Gerrit, and Walsh, Noelle

Subjects
MICROCLUSTERS, ATOMS, MICROPHYSICS, PENNING trap mass spectrometry, MASS spectrometry, ELECTRON impact ionization, ELECTRONIC excitation
Abstract

ClusterTrap is a setup devoted to the investigation of atomic clusters. The Penning trap allows various studies after preceding preparation steps. In particular, the clusters may be size selected and their charge state may be varied by electron impact ionization or electron attachment during storage. On the other hand the clusters can be used for extended studies of the properties of the Penning trap. Both aspects are described with recent examples. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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2. The elliptical Penning trap: Experimental investigations and simulations

Author

Breitenfeldt, Martin, Baruah, Sudarshan, Blaum, Klaus, Herlert, Alexander, Kretzschmar, Martin, Martinez, Franklin, Marx, Gerrit, Schweikhard, Lutz, and Walsh, Noelle

Subjects
*QUANTUM electrodynamics, *SPECTROMETRY, *MASS spectrometry, *INTERMEDIATES (Chemistry)
Abstract

Abstract: The application of an additional azimuthal quadrupolar electrostatic field to a Penning trap leads to a field configuration referred to as an elliptical Penning trap. The resulting changes of the radial ion motions have been investigated experimentally and by use of simulations. The eigenfrequencies, i.e., the magnetron frequency and the reduced cyclotron frequency , are found to be shifted with respect to those of the standard Penning trap , , respectively. As the shift of the magnetron frequency is larger than that of the reduced cyclotron frequency their sum is also a function of the ellipticity and no longer equal to the cyclotron frequency in the absence of an electric trapping field . The frequency shifts were investigated for argon and fullerene ions. The experimental studies were performed by time-of-flight (ToF) analysis of the ion cyclotron resonance and by Fourier-transform ion-cyclotron-resonance mass spectrometry (FT-ICR MS). The experimental and simulated values are in agreement with theoretical predictions [M. Kretzschmar, this issue] when the influence of higher multipole terms is taken into account. [Copyright &y& Elsevier]

Published
2008
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