Dissociative Recombination and Excitation of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\mathrm{CH}\,^{+}_{5}$ \end{document} : Absolute Cross Sections and Branching Fractions

1998 ◽  
Vol 498 (2) ◽  
pp. 886-895 ◽  
Author(s):  
J. Semaniak ◽  
A. Larson ◽  
A. Le Padellec ◽  
C. Stromholm ◽  
M. Larsson ◽  
...  
Keyword(s):  
Cross Sections ◽  
Branching Fractions ◽  
Dissociative Recombination

Dissociative recombination of the deuterated acetaldehyde ion, CD3CDO+: product branching fractions, absolute cross sections and thermal rate coefficient

2007 ◽  
Vol 9 (22) ◽  
pp. 2856-2861 ◽  
Author(s):  
Erik Vigren ◽  
Magdalena Kamińska ◽  
Mathias Hamberg ◽  
Vitali Zhaunerchyk ◽  
Richard D. Thomas ◽  
...  
Keyword(s):  
Cross Sections ◽  
Rate Coefficient ◽  
Branching Fractions ◽  
Dissociative Recombination ◽  
Product Branching

scholarly journals Dissociative Recombination of D3S+: Product Branching Fractions and Absolute Cross Sections

2008 ◽  
Vol 681 (2) ◽  
pp. 1717-1724 ◽  
Author(s):  
M. Kamińska ◽  
E. Vigren ◽  
V. Zhaunerchyk ◽  
W. D. Geppert ◽  
H. Roberts ◽  
...  
Keyword(s):  
Cross Sections ◽  
Branching Fractions ◽  
Dissociative Recombination ◽  
Product Branching

Dissociative recombination ofH2D+: Cross sections, branching fractions, and isotope effects

1995 ◽  
Vol 52 (4) ◽  
pp. 2901-2909 ◽  
Author(s):  
S. Datz ◽  
M. Larsson ◽  
C. Stromholm ◽  
G. Sundström ◽  
V. Zengin ◽  
...  
Keyword(s):  
Cross Sections ◽  
Isotope Effects ◽  
Branching Fractions ◽  
Dissociative Recombination

Dissociative recombination cross sections for NH4+ions and electrons

1978 ◽  
Vol 17 (4) ◽  
pp. 1314-1320 ◽  
Author(s):  
R. D. DuBois ◽  
J. B. Jeffries ◽  
G. H. Dunn
Keyword(s):  
Cross Sections ◽  
Dissociative Recombination

MEASUREMENT OF THE $D \bar{D}$ CROSS SECTIONS AND D HADRONIC BRANCHING FRACTIONS

2005 ◽  
Vol 20 (16) ◽  
pp. 3701-3703
Author(s):  
Guang-Pei Chen
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Branching Fractions ◽  
Hadronic Decay ◽  
Decay Modes ◽  
The Cross

Using 57.2 pb-1 of data collected with the CLEO-c detector at the ψ(3770) resonance, we measure absolute branching fractions for three D0 and two D+ Cabibbo-allowed hadronic decay modes, and the cross section for [Formula: see text] at [Formula: see text].

Hydrogen and helium escape on Venus via energy transfer from hot oxygen atoms

2020 ◽  
Vol 501 (2) ◽  
pp. 2394-2402
Author(s):  
Hao Gu ◽  
Jun Cui ◽  
Dandan Niu ◽  
Jiang Yu
Keyword(s):  
Cross Sections ◽  
Dominant Role ◽  
Monte Carlo Model ◽  
Dissociative Recombination ◽  
Angle Distribution ◽  
Model Uncertainties ◽  
Atmospheric Escape ◽  
Parallel Approximation ◽  
Hot Oxygen ◽  
Energy Dependent

ABSTRACT Due to the relatively strong gravity on Venus, heavy atmospheric neutrals are difficult to accelerate to the escape velocity. However, a variety of processes, such as the dissociative recombination of ionospheric O$_2^+$, are able to produce hot atoms which could deliver a significant amount of energy to light neutrals and drive their escape. In this study, we construct a Monte Carlo model to simulate atmospheric escape of three light species, H, H2, and He, on Venus via such a knock-on process. Two Venusian background atmosphere models are adopted, appropriate for solar minimum and maximum conditions. Various energy-dependent and species-dependent cross-sections, along with a common strongly forward scattering angle distribution, are used in our calculations. Our model results suggest that knock-on by hot O likely plays the dominant role in driving total atmospheric hydrogen and helium escape on Venus at the present epoch, with a significant portion contributed from regions below the exobase. Substantial variations are also revealed by our calculations. Of special interest is the modelled reduction in escape flux at high solar activities for all species, mainly associated with the enhancement in thermal O concentration near the exobase at high solar activities which hinders escape. Finally, model uncertainties due to several controlling factors, including the distribution of relevant light species in the background atmosphere, the plane-parallel approximation, and the finite O energy distribution, are evaluated.

scholarly journals Dissociative Recombination of CH+ Molecular Ion Induced by Very Low Energy Electrons

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 82 ◽  
Author(s):  
Zsolt J. Mezei ◽  
Michel D. Epée Epée ◽  
Ousmanou Motapon ◽  
Ioan F. Schneider
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Incident Energy ◽  
Dissociative Recombination ◽  
Boltzmann Distribution ◽  
Rate Coefficients ◽  
Rotational States ◽  
Low Energy Electrons ◽  
Quantum Defect Theory ◽  
Π State

We used the multichannel quantum defect theory to compute cross sections and rate coefficients for the dissociative recombination of CH + initially in its lowest vibrational level v i + = 0 with electrons of incident energy below 0.2 eV. We have focused on the contribution of the 2 2 Π state which is the main dissociative recombination route at low collision energies. The final cross section is obtained by averaging the relevant initial rotational states ( N i + = 0 , ⋯ , 10 ) with a 300 K Boltzmann distribution. The Maxwell isotropic rate coefficients for dissociative recombination are also calculated for different initial rotational states and for electronic temperatures up to a few hundred Kelvins. Our results are compared to storage-ring measurements.

scholarly journals 18. A note on the head echo problem

1968 ◽  
Vol 33 ◽  
pp. 187-189 ◽  
Author(s):  
J. Rajchl
Keyword(s):  
Cross Sections ◽  
Dissociative Recombination ◽  
Molecular Flow ◽  
Recombination Coefficient ◽  
Interaction Layer ◽  
Atmospheric Molecules ◽  
A Value ◽  
The Mean ◽  
Head Echo ◽  
Absolute Magnitudes

A model of the head echo is examined, in which, as a source of ionization and recombination, an interaction layer of impinging atmospheric molecules (O2) mixing with reflected ones is assumed. Dissociative recombination is considered as the most probable process. If we suppose that the interaction layer is that arising in nearly free molecular flow with no shock wave present, we obtain, using the observed heights of head echoes, dimensions of meteoroids in the range 10–1 cm for absolute magnitudes between −10 and −2. It is shown that such a layer may be used to explain the high initial recombination coefficient of the order of 10−5 cm3/sec. Using the ionization collision cross-sections measured by Utterback (1963) we obtain for the mean extent of the interaction layer a value 1–100 m for heights 80–130 km, in accordance with radar observations.

Total cross sections for the dissociative recombination of H3+, HD2+and D3+

1984 ◽  
Vol 17 (24) ◽  
pp. L909-L913 ◽  
Author(s):  
J B A Mitchell ◽  
C T Ng ◽  
L Forand ◽  
R Janssen ◽  
J Wm McGowan
Keyword(s):  
Cross Sections ◽  
Dissociative Recombination ◽  
Total Cross Sections
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