Deflection of an ion beam in the two-dimensional electrostatic quadrupole field

Zeman, Herbert

doi:10.1063/1.1135188

Cited by 94 publications

(29 citation statements)

References 22 publications

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“…For every cluster material the distance is systematically optimized. Cluster ions are then generated by electron impact ionization (at 90 eV) and separated from the neutral beam via a quadrupole deflector [7]. After decelerating the ions down to the desired kinetic energy (injection energy 30 eV), they are gated with 10 µs pulses into a drift cell (length 31 mm) filled with helium (pressure typically 1 mbar).…”

Section: Methodsmentioning

confidence: 99%

Ion mobility measurements of metal halide clusters

Maier-Borst

Löffler

Pétry

et al. 1997

Z Phys D - Atoms, Molecules and Clusters

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The failure of standard solid state methods to determine the structure of very small clusters has been the starting point to adapt the ion chromatography technique to cluster experiments. A new approach combining an ion drift cell and a time-of-flight mass spectrometer for cluster ion mobility measurements is described. In this publication we concentrate on the experimental set-up and the data analysis starting with the time-of-flight mass spectra. Furthermore, first results concerning relative ion mobilities for cesium iodide and sodium iodide clusters will be shown to demonstrate the feasibility of the new tandem instrument.

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Section: Methodsmentioning

confidence: 99%

Ion mobility measurements of metal halide clusters

Maier-Borst

Löffler

Pétry

et al. 1997

Z Phys D - Atoms, Molecules and Clusters

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“…This chamber is pumped by a 550-l/s turbo pump (Varian, Turbo-V550) and the background pressure is typically 10 −6 to 10 −8 mbar. The anions are separated from the neutral complexes and the cations by means of a quadrupole deflector (26) and subsequently focused into the laser interaction region. The interaction with the laser takes place at the entrance of a quadrupole mass spectrometer (Balzers, QMS 400) capable of detecting both anions and cations.…”

Section: Resultsmentioning

confidence: 99%

The Transition Metal Complex (η5-C5H5)Fe(CO)2Cl in Its Neutral, Anionic, and Cationic States—Density Functional Theory Calculations and Mass Spectroscopical Investigations

Vierheilig

Moigno

Kiefer

et al. 2002

Journal of Molecular Spectroscopy

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“…[2][3][4][5][6] In accord with the potential V(x, y) into the quadrupole deflector 5 of cylindrical symmetry (Fig. 1), it is calculated from the following expression:…”

Section: Resultsmentioning

confidence: 99%

“…for research into photodissociation processes of molecular ions under ion and laser beams interaction, 2 and in the collector system of a quadrupole secondary ion mass spectrometer. 3,4 This paper reports the original design of a simple SIMS setup based on a particular QD configuration that allows simultaneous positive and negative secondary ion detection of different masses by two quadrupole analyzers.…”

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confidence: 99%

Quadrupole secondary ion mass spectrometer for simultaneous detection of positive and negative ions

Daolio

Facchin

Pagura

et al. 1999

Rapid Commun. Mass Spectrom.

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The purpose of this study was to design a quadrupole secondary ion mass spectrometer for simultaneous detection of both positive and negative ions of different mass. An original setup based on a quadrupole electrostatic deflector configuration that allows energy and spatial separation of all types of secondary ions was proposed. The device was modeled using the SIMION 3D program before building the prototype. Trajectory and acceptance calculations were provided. Positive and negative secondary ion mass spectra for molybdenum test samples were obtained. Copyright # 1999 John Wiley & Sons Ltd. Received 16 February 1999; Revised 1 March 1999; Accepted 2 March 1999 Elemental compositions of samples with surfaces that are quickly and irreversibly destroyed by primary ion beam bombardment and containing both electropositive and electronegative components may be better evaluated by simultaneous analysis of positive and negative secondary ions. This allows a direct correlation between signal intensities from all ion species sputtered at the same time from the same bombarded area.Another interesting application of this technique is in the field of secondary ion mass spectrometry (SIMS) imaging, where simultaneous detection of secondary positive ions and secondary electrons may add topographical contrast to surface chemical images produced by ion bombardment.A design for an instrument for fast atom bombardment SIMS provided with simultaneous detection of positive and negative secondary ions has already been described. 1 In this spectrometer energy and space separation of the secondary ions with different polarity was obtained by a specially designed electrostatic analyzer at the output of a quadrupole mass filter consisting of four wire electrodes and a grounded shield case. The two diagonal wire electrodes have the same applied voltage and the others have an applied voltage of opposite polarity. The main drawbacks of such a spectrometer are the absence of simultaneous detection of positive and negative ions with different masses which is particularly important for depth profiling and imaging, and the energy separation of secondary ions after quadrupole that leads to a reduction in mass resolution.Previously a quadrupole electrostatic deflector (QD) was successfully used as an energy analyzer in some installations, e.g. for research into photodissociation processes of molecular ions under ion and laser beams interaction, 2 and in the collector system of a quadrupole secondary ion mass spectrometer. 3,4 This paper reports the original design of a simple SIMS setup based on a particular QD configuration that allows simultaneous positive and negative secondary ion detection of different masses by two quadrupole analyzers. EXPERIMENTALA schematic layout of the secondary ion mass spectrometer is shown in Fig. 1. The unit consists of a newly designed quadrupole electrostatic energy analyzer/deflector (1), an inert gas ion gun model 3M (Kratos Analytical Instruments, Manchester, England) (2), two quadrupole mass analyzers mode...

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Deflection of an ion beam in the two-dimensional electrostatic quadrupole field

Cited by 94 publications

References 22 publications

Ion mobility measurements of metal halide clusters

Ion mobility measurements of metal halide clusters

The Transition Metal Complex (η5-C5H5)Fe(CO)2Cl in Its Neutral, Anionic, and Cationic States—Density Functional Theory Calculations and Mass Spectroscopical Investigations

Quadrupole secondary ion mass spectrometer for simultaneous detection of positive and negative ions

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