Two- and Three-Body Dissociation Dynamics of Temporary Negative Ion NF3–

2013 ◽  
Vol 117 (15) ◽  
pp. 3176-3182 ◽  
Author(s):  
Hong-Kai Li ◽  
Lei Xia ◽  
Xian-Jin Zeng ◽  
Shan Xi Tian
Keyword(s):  
Negative Ion ◽  
Dissociation Dynamics ◽  
Three Body

Note on radiationless transitions involving three-body collisions

1936 ◽  
Vol 32 (3) ◽  
pp. 482-485 ◽  
Author(s):  
R. A. Smith
Keyword(s):  
Continuous Spectrum ◽  
Negative Ions ◽  
Bound State ◽  
Excess Energy ◽  
Negative Ion ◽  
Positive Ions ◽  
Continuous State ◽  
Direct Formation ◽  
Three Body ◽  
Positive Ion

When an electron makes a transition from a continuous state to a bound state, for example in the case of neutralization of a positive ion or formation of a negative ion, its excess energy must be disposed of in some way. It is usually given off as radiation. In the case of neutralization of positive ions the radiation forms the well-known continuous spectrum. No such spectrum due to the direct formation of negative ions has, however, been observed. This process has been fully discussed in a recent paper by Massey and Smith. It is shown that in this case the spectrum would be difficult to observe.

scholarly journals Communication: Imaging the indirect dissociation dynamics of temporary negative ion: N2O− → N2 + O−

2012 ◽  
Vol 137 (15) ◽  
pp. 151102 ◽  
Author(s):  
Lei Xia ◽  
Bin Wu ◽  
Hong-Kai Li ◽  
Xian-Jin Zeng ◽  
Shan Xi Tian
Keyword(s):  
Negative Ion ◽  
Dissociation Dynamics

Dissociative electron attachment to the complexation ligands hexafluoroacetylacetone, trifluoroacetylacetone and acetylacetone; a comparative experimental and theoretical study

RSC Advances ◽  
2014 ◽  
Vol 4 (63) ◽  
pp. 33222-33235 ◽  
Author(s):  
Benedikt Ómarsson ◽  
Sarah Engmann ◽  
Oddur Ingólfsson
Keyword(s):  
Theoretical Study ◽  
Electron Attachment ◽  
Negative Ion ◽  
Dissociative Electron Attachment ◽  
Dissociation Dynamics

Influence of fluorination on the negative ion resonances and dissociation dynamics in electron attachment to acetylacetone, trifluoroacetylacetone and hexafluoroacetylacetone are explored through calculations and experiments.

Negative ion – molecule reactions

1969 ◽  
Vol 47 (10) ◽  
pp. 1815-1820 ◽  
Author(s):  
E. E. Ferguson
Keyword(s):  
Charge Transfer ◽  
Rate Constants ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Negative Ion ◽  
Transfer Reactions ◽  
Ion Molecule Reactions ◽  
Charge Transfer Reactions ◽  
Three Body ◽  
Interchange Reactions

Laboratory reaction rate constant measurements for negative ion – atom interchange reactions, negative ion charge transfer reactions, and negative ion three-body association reactions of aeronomic interest are reviewed and the available data tabulated. The present experimental techniques in use are briefly summarized. Most of the rate constants have been measured only at 300 °K; in a few cases data is available at energies [Formula: see text] as well as at 300 °K, so that an indication of the energy dependence of the rate constants is available.

Dissociative photodetachment studies of O−(H2O)2, OH−(H2O)2, and the deuterated isotopomers: Energetics and three-body dissociation dynamics

2001 ◽  
Vol 114 (19) ◽  
pp. 8436-8444 ◽  
Author(s):  
Todd G. Clements ◽  
A. Khai Luong ◽  
Hans-Jürgen Deyerl ◽  
Robert E. Continetti
Keyword(s):  
Dissociation Dynamics ◽  
Dissociative Photodetachment ◽  
Three Body

Negative chlorine ion chemistry in the upper stratosphere and its application to an artificially created dense electron cloud

1995 ◽  
Vol 13 (3) ◽  
pp. 296-304 ◽  
Author(s):  
S. S. Prasad
Keyword(s):  
Major Ions ◽  
Negative Ions ◽  
Electron Cloud ◽  
Negative Ion ◽  
Cluster Ions ◽  
Aerosol Formation ◽  
Ion Chemistry ◽  
Catalytic Destruction ◽  
Three Body ◽  
Chlorine Ion

Abstract. This paper discusses new potential reactions of chlorine-bearing anions (negative ions) in the upper stratosphere. These reactions are then applied to the negative-ion chemistry following the injection of an electron cloud of very high density, of the order of 106-107 e- cm-3, in the 40-45-km region. The idea is to evaluate the recently proposed scheme to mitigate ozone depletion by converting the reactive chlorine atoms at these altitudes into Cl- ions which are unreactive towards ozone, i.e., electron scavenging of Cl. We find that the previously neglected photodetachment from Cl- is fast. For an overhead sun, this process may have a rate coefficient of 0.08 s-1 when multiple scattering is included. The rate could be even higher, depending on the ground albedo. Switching reaction between Cl-·H2O and HCl might lead to the formation of Cl-·HCl anion. Possible reactions of Cl-·H2O and Cl-·HCl with O atoms could produce ClO- and Cl-2. The production of ClO- in this manner is significant because Cl- having a high photodetachment rate constant would be regenerated in the very likely reactions of ClO- with O. When these possibilities are considered, then it is found that the chlorine anions may not be the major ions inside the electron cloud due to the rapid photodetachment from Cl-. Furthermore, in such a cloud, there may be the hazard that the Cl--Cl-·H2O-ClO--Cl- cycle amounts to catalytic destruction of two O atoms. Thus, the scheme could be risky if practised in the altitude region where atomic oxygen is an important constituent. Similar conclusions apply even if the ClO- species forms ClO-3 by three-body association with O2, instead of reacting with O. It must be emphasized that the present study is speculative at this time, because none of the relevant reactions have been investigated in the laboratory as yet. Nevertheless, it is very safe to say that the scheme of ozone preservation by electron scavenging of the upper stratospheric Cl is much less certain than implied in the studies reported by its original proponents, because those studies neglected the photodetachment from Cl- and made the highly unlikely assumption that the Cl-·H2O anion neither photodissociates nor reacts any further. The situation at the lower altitudes could be even more complex due to the formation of large cluster ions and the ion-induced aerosol formation. The lower atmospheric situation, therefore, requires much more study. The uncertainties in the scavenging scheme due to the electrostatic repulsion in the cloud should also be addressed. Despite the uncertainties about its environmental engineering usefulness, the emerging technology for artificial creation of plasmas, with any desired density and charge in the stratosphere, could have significant pure scientific values in the studies of stratospheric ion chemistry and ion-induced aerosol formation. Such studies have perennially suffered from the extremely low densities of the naturally occurring plasma.

THE HYLLERAAS BINDING ENERGY OF HYDRIDE AND ELECTRON AFFINITIES

2013 ◽  
Vol 12 (04) ◽  
pp. 1350016 ◽  
Author(s):  
EDWARD S. CHEN ◽  
EDWARD C. M. CHEN
Keyword(s):  
Binding Energy ◽  
Electron Affinity ◽  
Ground State ◽  
Photoelectron Spectra ◽  
Negative Ion ◽  
Electron Affinities ◽  
Thermal Electron ◽  
Homonuclear Diatomic Molecules ◽  
Correlation Rules ◽  
Three Body

The normalized electron affinity of the hydrogen atom, is the fundamental measure of anionic electron correlation. The three-body H (−) and AB(−) systems analogous to Efimov three-body bosons support multiple excited states. The first complete set of ground state electron affinities of the main group atoms and homonuclear diatomic molecules are reported using the Hylleraas variational binding energy of the hydride anion. Thermal electron affinities and activation energies for the formation of the 27 bonding states of O 2(−) are reported from electron capture detector and atmospheric pressure negative ion mass spectrometry. These are iterated through magnetron, flame, swarm, electron impact, photodetachment, and negative ion photoelectron spectra to obtain more precise self-consistent values. Electron affinities for NO are similarly reported. These data are used to calculate Herschbach ionic Morse Person electron curves for the 54 O 2(−) and 87 NO (−) states predicted by adiabatic correlation rules. A new ground state adiabatic electron affinity of SF6 3.00(10) eV is determined from negative ion mass spectra.

The negative ion of positronium: measurement of the decay rate and prospects for further experiments

2007 ◽  
Vol 85 (5) ◽  
pp. 487-495 ◽  
Author(s):  
F Fleischer ◽  
G Gwinner ◽  
C Hugenschmidt ◽  
K Schreckenbach ◽  
P Thirolf ◽  
...  
Keyword(s):  
Decay Rate ◽  
Bound State ◽  
Negative Ion ◽  
Experimental Result ◽  
Three Body Problem ◽  
Positron Source ◽  
Interesting Object ◽  
Three Body ◽  
Beam Foil

The negative positronium (Ps–) ion consisting of two electrons and a positron (e+e–e–), represents the simplest three-body system with a bound state. Its constituents are stable, point-like particles, and it is essentially free from perturbations by strong interaction effects. Together with the rather unique mass ratio, these properties make the positronium ion an interesting object for studying the quantum-mechanical three-body problem. We present a new determination of the decay rate of Ps–, using a beam-foil method and a stripping-based detection technique. The measured value of Γ = 2.089(15) ns–1 is a factor of six times more precise than the previous experimental result, and there is excellent agreement both with the latter and with the theoretical value. With the new high-intensity positron source NEPOMUC at the FRM-II research reactor in Munich being available, a further improvement in precision seems possible. Moreover, the high flux of low-energy positrons at this facility brings other properties of this exotic system within reach of experiments. The prospects for such investigations are discussed.PACS No.: 36.10Dr

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