Ion–Molecule Reactions Involving N2+, N+, O2+, and O+ Ions from 300°K to ∼1 eV

Johnsen, Rainer; Brown, H. L.; Biondi, Manfred A.

doi:10.1063/1.1672745

Cited by 88 publications

(39 citation statements)

References 10 publications

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“…For this reason, the transport properties of atomic oxygen cations moving through the rare gases have been of interest since 1969. 5,6 The various studies between then and 1987, including the work of Lindinger and Albritton 7 with ground-state ions and of Rowe et al 8 with excited-state ions, were summarized by Simpson et al 9 Unfortunately, the accuracies in the early reaction studies were often not better than 40% for rate coefficients, so errors in the ancillary transport properties were deemed acceptable even when they were as large as 10%.…”

Section: Introductionmentioning

confidence: 99%

Mobility of O+ in He and interaction potential of HeO+

Danailov

Viehland²,

Johnsen³

et al. 2006

The Journal of Chemical Physics

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New experimental measurements are reported for the mobility of O + ions in He gas at 300 K. The accuracy of these new values is estimated as ±2.5%, which allows them to serve as a stringent test of a new ab initio potential that we have calculated using the RCCSD͑T͒ method. We employed the aug-cc-pV5Z basis set with counterpoise corrections and took spin-orbit coupling into account. The present experimental values lie below the calculated ones, but the difference becomes statistically significant only at moderate and high values of the ratio of the electric field strength to the gas number density; even there they are only marginally significant.

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Section: Introductionmentioning

confidence: 99%

Mobility of O+ in He and interaction potential of HeO+

Danailov

Viehland²,

Johnsen³

et al. 2006

The Journal of Chemical Physics

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“…5 a and b indicate that the interaction potential for small cross sections must increasingly resemble the potential of a hard sphere. Equation (8) correctly describes the energy dependence of the cross section for most energies and for all excited states of the ions studied. The cross sections for ions at thermal energy oth extend from 40 Ä 2 to 190 Ä 2 .…”

Section: Resultsmentioning

confidence: 99%

Luminescence of Diatomic Molecules II. Energy Dependence of Collisional Deactivation Cross Sections

Comes

Speier

1972

Zeitschrift Für Naturforschung A

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Photoionization has been used to produce ions of N2 , 02 . and CO in definite excited states. Deactivating collisions of these ions with molecular gases were described in paper I, where the cross sections of ions with thermal velocity are given for various electronic and vibrational states.By application of an electric field the charged particles are accelerated yielding information on the influence of the kinetic energy of the collision partners on these deactivating collisions. The cross section is found to follow an exponential law o ~ E~a , with a varying between 0.34 and 0 41 for the different excited stales of the molecular ions. The observations were carried out for a range of kinetic energies from the thermal energy up to 6 eV maximum. This simple exponential law is followed for kinetic energies up to at least 2 eV. At higher energies slight deviations were found to occur. IntroductionOne spectroscopic means for analysis of a gaseous sample is to measure its emission spectrum.Luminescence spectra give detailed information about the state of the molecules in question. The measurement of luminescence allows conclusions to be drawn about other competing processes, e. g. collisional deactivation, if the remaining experimental parameters such as time and gas pressure are considered. This procedure has been described in paper 1 1 for excited molecular ions. In this earlier publication molecular ions at room temperature having a thermal velocity distribution were treated.The measured cross sections for collisional deactivation are thus valid for this mean energy only. In general the method provides information about a large number of molecular states. This makes it possible to measure the influence of the excitation energy of a molecule on the ongoing collisional processes. Also the influence of the translational energy in these collisions can be measured. This is comparatively easy in the case of ionic collision partners. Only a relatively simple additional experimental setup as compared to that described in paper I is required. A variable electric field of defined geometry is introduced inside the collision chamber so that the ions can be accelerated after their formation. The ions will not have a uniform energy * In the past many experiments were undertaken to measure the energy dependence of ion-neutral collisions 2 ' 3 . Charge transfer and ion-molecule reactions were emphasized. For both processes theoretical models were developed which are, however, restricted to atoms in the case of charge transfer.GIOUMOUSIS and STEVENSON 4 applying Langevin's calculations to describe ion-molecule reactions predict that the product of cross section and particle velocity for such a reaction is constant. The quantum state of the ion is not taken into account; only the polarisability of the neutral collision partner is considered. Many experimental attempts were made to check this theory.The way to determine the energy dependence of such cross sections, however, differs in a luminescence experiment from other experimental...

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“…Early studies of small gas-phase ions and molecules also applied corona ion discharge (19,64) and radioactive ion sources. (65) Laser desorption ionization is useful for the ionization of solid samples and has been demonstrated on carbon clusters, silicon clusters, and fullerenes.…”

Section: Othersmentioning

confidence: 99%

“…The hybrid IMS-qMS instrument setup was introduced in the 1970s (64) for monitoring ion-molecule reactions of oxygen and nitrogen species. The instrument mainly consists of three parts (the ion source, a DTIMS, and a qMS) located in separate chambers with small orifices to sustain the pressure differences.…”

Section: Ion Mobility Spectrometry-quadrupole Mass Spectrometrymentioning

confidence: 99%

Ion Mobility‐Mass Spectrometry

Jiang

Robinson

2013

Encyclopedia of Analytical Chemistry

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Ion mobility spectrometry (IMS) separates ions based on their mobility in an inert buffer gas in the presence of an electric field. The mobility of ions is based on their size, shape, and charge, thus IMS provides insights into structure. In addition to being used for structural information, IMS can also be used as a separation device for complex mixtures. When coupled with mass spectrometry (MS), IMS–MS offers a powerful hybrid analytical technique that has many biological, pharmaceutical, structural, environmental, and other applications. This article provides an overview of IMS–MS, which focuses on principles of drift‐time ion mobility spectrometry (DTIMS), high‐field‐asymmetric ion mobility spectrometry (FAIMS), and traveling wave ion mobility spectrometry (TWIMS) methods. Several IMS–MS instruments are discussed and examples of the current applications of the technology are provided.

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Ion–Molecule Reactions Involving N2+, N+, O2+, and O+ Ions from 300°K to ∼1 eV

Cited by 88 publications

References 10 publications

Mobility of O+ in He and interaction potential of HeO+

Mobility of O+ in He and interaction potential of HeO+

Luminescence of Diatomic Molecules II. Energy Dependence of Collisional Deactivation Cross Sections

Ion Mobility‐Mass Spectrometry

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