REMPI in a focusing rf-quadrupole: a new source for mass-, energy-, and state-selected ions

Stefan, Mark; Glenewinkel‐Meyer, Th.; Gerlich, D.

doi:10.1080/01442359609353185

Cited by 14 publications

(15 citation statements)

References 27 publications

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“…With such a multi-electrode structure the electrodes of which are at large distances, extremely slow and narrow ion beams can be prepared. 16 For creation of the supersonic beam a pulsed valve is used. Two differential pumping stages maintain a sufficiently low background pressure of the target gas in the interaction chamber.…”

Section: Guided Ion Beam Merged With a Neutral Beammentioning

confidence: 99%

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The Study of Cold Collisions Using Ion Guides and Traps

Gerlich¹

2008

Low Temperatures and Cold Molecules

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Section: Guided Ion Beam Merged With a Neutral Beammentioning

confidence: 99%

“…16. Temperature dependence of the ternary rate coefficients for the reaction He + + 2He → He + 2 + He.…”

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confidence: 99%

The Study of Cold Collisions Using Ion Guides and Traps

Gerlich¹

2008

Low Temperatures and Cold Molecules

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“…An example is the special photoionization source for mass-, energy-, and state-selected ions described in ref. 24. Low temperature applications of state-selective preparation of diatomic ions via resonance enhanced multi-photon ionization have been summarized recently.…”

Section: Preparing Cold Ions Via Photoionizationmentioning

confidence: 99%

Buffer gas cooling of polyatomic ions in rf multi-electrode traps

Gerlich

Borodi

2009

Faraday Discuss.

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Cooling all degrees of freedom of a molecule, a cluster, or even a nanoparticle which is suspended in a vacuum, is an experimental challenge. Without suitable schemes, cold or ultracold chemical reactions are not feasible. Methods such as laser based preparation of very slow atoms, decelerating molecules to low velocities with electric fields or freezing molecular ions into Coulomb crystals, are generally not suitable to cool the vibrational or rotational motion of molecules. This contribution describes a new method in which a beam of slow atoms or molecules (H, He, H2, or D2) is used for cooling charged particles confined in a multi-electrode rf trap. For reaching sub-K temperatures, the fast part of a cold effusive beam is removed with a shutter before the slow remaining neutrals interact with the ion cloud. The development of a pulsed cold beam source is discussed as well as suitable methods for determining the ion temperature. A challenging application is to prepare internally cold CH5+ for spectroscopy or chemistry. New experimental results for hydrogen abstraction in collisions with slow H atoms are reported at energies of a few meV. For evaluating these measurements and for predicting effective rate coefficients at lower energies, the kinematic conditions of the slow neutral beam-ion trap arrangement have been analyzed in detail. The potential of cooling ions such as protonated methane or H3+ with slow energy selected H atoms is briefly mentioned. An interesting process is the formation of weakly bound ions such as H4+ or CH6+ via radiative or ternary association. Such ions are ideal candidates for preparing the corresponding collision complexes very close (microeV) to the dissociation continuum using infrared transitions.

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“…2, can be approximated by properly formed electrodes, thin wires etc. A quadrupole made from 60 thin rods (1 mm diameter) has been described by Mark et al 18 Usually the hyperbolic boundary conditions of the special solutions called multipoles are approximated by circular rods. A first order approximation of the rod diameter d is r 0 ~(n 2 1) d/2, where 2n corresponds to the number of poles and r 0 the inscribed radius (example d ~1 mm, r 0 ~5 mm, 2n ~22), better approximations have been reported in the literature 2 but are not relevant if one wants to use the electrode arrangement just as an ion guide or trap.…”

Section: Electrode Arrangementsmentioning

confidence: 99%

Applications of rf fields and collision dynamics in atomic mass spectrometryThe opinions expressed in the following article are entirely those of the author and do not necessarily represent the views of the Royal Society of Chemistry, the Editor or the Editorial Board of JAAS.

Gerlich

2004

J. Anal. At. Spectrom.

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REMPI in a focusing rf-quadrupole: a new source for mass-, energy-, and state-selected ions

Cited by 14 publications

References 27 publications

The Study of Cold Collisions Using Ion Guides and Traps

The Study of Cold Collisions Using Ion Guides and Traps

Buffer gas cooling of polyatomic ions in rf multi-electrode traps

Applications of rf fields and collision dynamics in atomic mass spectrometryThe opinions expressed in the following article are entirely those of the author and do not necessarily represent the views of the Royal Society of Chemistry, the Editor or the Editorial Board of JAAS.

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