scholarly journals Role of Negative Ion Resonances in Electron Scattering from Atoms and Molecules

1999 ◽  
Vol 52 (3) ◽  
pp. 473 ◽  
Author(s):  
S. J. Buckman ◽  
D. T. Alle ◽  
M. J. Brennan ◽  
P. D. Burrow ◽  
J. C. Gibson ◽  
...  
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Negative Ions ◽  
Negative Ion ◽  
Electron Correlations ◽  
Molecular Systems ◽  
Atoms And Molecules ◽  
Wide Range ◽  
Scattering Cross Sections

Transient negative ions (resonances) formed during the collision of an electron with an atom or molecule have been extensively studied for over thirty years. The continued interest in these states, both experimentally and theoretically, stems from the profound effects that they can have on electron scattering cross sections and the role that electron–electron correlations play in their formation and quasi-stability. A selective discussion of examples of such resonances, involving one, two and three excited electrons is given for a wide range of atomic and molecular systems.

Compound state electron spectra of simple molecules

1968 ◽  
Vol 305 (1483) ◽  
pp. 493-515 ◽  
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Preliminary Analysis ◽  
Negative Ion ◽  
Total Electron ◽  
Electron Spectra ◽  
Compound State ◽  
Simple Molecules ◽  
Scattering Cross Sections ◽  
Electrostatic Analyser

Compound negative ion states of molecules N 2 , CO, NO, O 2 , CO 2 , N 2 O and NO 2 have been detected as structure in the total electron scattering cross-sections, interpreted in terms of the Beutler–Fano equation, and partially identified by comparison with isoelectronic species : N 2 -2 ІІ g , 2 eV ; CO -2 II , 1·5 eV ; NO -1 Ʃ + , 1 eV ; O 2 -2 II u , 0·8 eV. The performance of the inverse first-power electrostatic analyser is treated ; it compares satisfactorily with theory provided that preliminary analysis is performed ; otherwise ‘false resonances’ or ghosts may occur.

scholarly journals Rosetta Mission: Electron Scattering Cross Sections - Data Needs and Coverage in BEAMDB Database

2017 ◽  
Author(s):  
Bratislav P. Marinković ◽  
Jan Hendrik Bredehöft ◽  
Veljko Vujčić ◽  
Darko Jevremović ◽  
Nigel J. Mason
Keyword(s):  
Electron Impact ◽  
Electron Scattering ◽  
Cross Sections ◽  
Molecular Data ◽  
Scattering Data ◽  
Particle Analysis ◽  
Detailed Knowledge ◽  
Molecular Systems ◽  
Rosetta Mission

The emission of [O I] lines in the coma of Comet 67P/Churyumov-Gerasimenko during the Rosetta mission have been explained by electron impact dissociation of water rather than the process of photodissociation. This is the direct evidence for the role of electron induced processing has been seen on such a body. Analysis of other emission features is handicapped by a lack of detailed knowledge of electron impact cross sections which highlights the need for a broad range of electron scattering data from the molecular systems detected on the comet. In this paper we present an overview of the needs for electron scattering data relevant for the understanding of observations in coma, the tenuous atmosphere and on the surface of 67P/Churyumov-Gerasimenko during the Rosetta mission. The relevant observations for elucidating the role of electrons come from optical spectra, particle analysis using the ion and electron sensors and mass spectrometry measurements. To model these processes electron impact data should be collated and reviewed in an electron scattering database and an example is given in the BEAMD, which is a part of a larger consortium of Virtual Atomic and Molecular Data Centre – VAMDC.

Elastic electron scattering with CH2Br2 and CCl2Br2: The role of the polarization effects

2021 ◽  
Author(s):  
Xiaoli Zhao ◽  
Kedong Wang
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Substantial Effect ◽  
Elastic Electron ◽  
Elastic Electron Scattering ◽  
Close Coupling ◽  
Polarization Effects ◽  
Impact Energies ◽  
Scattering Cross Sections

Abstract We present elastic electron scattering cross sections with holmethane molecules CH2Br2 and CCl2Br2 in the low energy region ranging from 0.01 to 20 eV. The calculations are performed with R-matrix method in static-exchange plus polarization (SEP) and close-coupling (CC) approximations. The integral, differential, and momentum transfer cross sections are calculated. The convergence of the obtained cross sections is checked at four different levels of SEP approximation. The predicted positions of the resonances agree well with available results. The precise resonance parameters are found to be sensitive to the treatment of polarization effects employed. We found that the polarization has a substantial effect on the cross sections, and this effect becomes even more important for lower impact energies.

scholarly journals A Critical Comparison of Electron Scattering Cross Sections measured by Single Collision and Swarm Techniques

1997 ◽  
Vol 50 (3) ◽  
pp. 483 ◽  
Author(s):  
Stephen J. Buckman ◽  
Michael J. Brunger
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Single Collision ◽  
Molecular Systems ◽  
Critical Comparison ◽  
Scattering Cross ◽  
Scattering Cross Sections

Electron scattering cross sections (elastic, rotational and vibrational excitation) for a number of atomic and (relatively) simple molecular systems are examined. Particular reference is made to the level of agreeement which is obtained from the application of the completely different measurement philosophies embodied in ‘beam’ and ‘swar’ techniques. The range of energies considered is generally restricted to the region below 5 eV.

scholarly journals Rosetta Mission: Electron Scattering Cross Sections—Data Needs and Coverage in BEAMDB Database

2017 ◽  
Author(s):  
Bratislav P. Marinković ◽  
Jan Hendrik Bredehöft ◽  
Veljko Vujčić ◽  
Darko Jevremović ◽  
Nigel J. Mason
Keyword(s):  
Electron Impact ◽  
Electron Scattering ◽  
Cross Sections ◽  
Molecular Data ◽  
Scattering Data ◽  
Particle Analysis ◽  
Detailed Knowledge ◽  
Molecular Systems ◽  
Rosetta Mission

The emission of [O I] lines in the coma of Comet 67P/Churyumov-Gerasimenko during the Rosetta mission have been explained by electron impact dissociation of water rather than the process of photodissociation. This is the direct evidence for the role of electron induced processing has been seen on such a body. Analysis of other emission features is handicapped by a lack of detailed knowledge of electron impact cross sections which highlights the need for a broad range of electron scattering data from the molecular systems detected on the comet. In this paper we present an overview of the needs for electron scattering data relevant for the understanding of observations in coma, the tenuous atmosphere and on the surface of 67P/Churyumov-Gerasimenko during the Rosetta mission. The relevant observations for elucidating the role of electrons come from optical spectra, particle analysis using the ion and electron sensors and mass spectrometry measurements. To model these processes electron impact data should be collated and reviewed in an electron scattering database and an example is given in the BEAMD, which is a part of a larger consortium of Virtual Atomic and Molecular Data Centre – VAMDC.

scholarly journals Electron scattering cross sections from nitrobenzene in the energy range 0.4–1000 eV: the role of dipole interactions in measurements and calculations

2020 ◽  
Vol 22 (24) ◽  
pp. 13505-13515 ◽  
Author(s):  
L. Álvarez ◽  
F. Costa ◽  
A. I. Lozano ◽  
J. C. Oller ◽  
A. Muñoz ◽  
...  
Keyword(s):  
Energy Range ◽  
Electron Scattering ◽  
Cross Sections ◽  
Total Electron ◽  
Electron Transmission ◽  
Scattering Cross ◽  
Dipole Interactions ◽  
Impact Energies ◽  
Scattering Cross Sections

Absolute total electron scattering cross sections (TCS) for nitrobenzene molecules with impact energies from 0.4 to 1000 eV have been measured by means of two different electron-transmission experimental arrangements.

Total electron scattering cross-sections for carbon monoxide at low electron energies

Pramana ◽  
1998 ◽  
Vol 51 (3-4) ◽  
pp. 453-461 ◽  
Author(s):  
P. Rawat ◽  
K. P. Subramanian ◽  
Vijay Kumar
Keyword(s):  
Carbon Monoxide ◽  
Electron Scattering ◽  
Cross Sections ◽  
Total Electron ◽  
Scattering Cross ◽  
Scattering Cross Sections

scholarly journals Single-Photon Multiple Detachment in Fullerene Negative Ions: Absolute Ionization Cross Sections and the Role of the Extra Electron

2013 ◽  
Vol 111 (4) ◽  
Author(s):  
R. C. Bilodeau ◽  
N. D. Gibson ◽  
C. W. Walter ◽  
D. A. Esteves-Macaluso ◽  
S. Schippers ◽  
...  
Keyword(s):  
Cross Sections ◽  
Single Photon ◽  
Negative Ions ◽  
Ionization Cross ◽  
Extra Electron ◽  
Ionization Cross Sections
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