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Dissociative Recombination of Molecular Ions with Electrons

Dissociative Recombination of Molecular Ions with Electrons PDF Author: Steven L. Guberman
Publisher: Springer Science & Business Media
ISBN: 1461500834
Category : Science
Languages : en
Pages : 473

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Book Description
Dissociative Recombination of Molecular Ions with Electrons is a comprehensive collection of refereed papers describing the latest developments in dissociative recombination research. The papers are written by the leading researchers in the field. The topics covered include the use of microwave afterglows, merged beams and storage rings to measure rate coefficients and to identify the products and their yields. The molecules studied range in size from the smallest, H2+, to bovine insulin ions. The theoretical papers cover the important role of Rydberg states and the use of wave packets and quantum defect theory to deduce cross sections, rate constants and quantum yields. Several theoretical and experimental papers address the controversial topic of H3+ dissociative recombination and its importance in the interstellar medium. Dissociative recombination studies of other molecular ions in the interstellar medium and in cometary and planetary atmospheres are covered. Ionization is an important competitive process to dissociative recombination and its competition with predissociation and its role in the reverse process of the association of neutral species is presented. Dissociative attachment, in which an electron attaches to a neutral molecule, has many similarities to dissociative recombination. The topics covered include the accurate calculation of electron affinities, attachment to molecules, clusters, and to species absorbed on solid surfaces and electron scattering by a molecular anion.

Dissociative Recombination of Molecular Ions with Electrons

Dissociative Recombination of Molecular Ions with Electrons PDF Author: Steven L. Guberman
Publisher: Springer Science & Business Media
ISBN: 1461500834
Category : Science
Languages : en
Pages : 473

View

Book Description
Dissociative Recombination of Molecular Ions with Electrons is a comprehensive collection of refereed papers describing the latest developments in dissociative recombination research. The papers are written by the leading researchers in the field. The topics covered include the use of microwave afterglows, merged beams and storage rings to measure rate coefficients and to identify the products and their yields. The molecules studied range in size from the smallest, H2+, to bovine insulin ions. The theoretical papers cover the important role of Rydberg states and the use of wave packets and quantum defect theory to deduce cross sections, rate constants and quantum yields. Several theoretical and experimental papers address the controversial topic of H3+ dissociative recombination and its importance in the interstellar medium. Dissociative recombination studies of other molecular ions in the interstellar medium and in cometary and planetary atmospheres are covered. Ionization is an important competitive process to dissociative recombination and its competition with predissociation and its role in the reverse process of the association of neutral species is presented. Dissociative attachment, in which an electron attaches to a neutral molecule, has many similarities to dissociative recombination. The topics covered include the accurate calculation of electron affinities, attachment to molecules, clusters, and to species absorbed on solid surfaces and electron scattering by a molecular anion.

Dissociative Recombination of Molecular Ions

Dissociative Recombination of Molecular Ions PDF Author: Larsson Mats Orel Ann E
Publisher:
ISBN: 9780511394874
Category : Science
Languages : en
Pages : 392

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Book Description
Dissociative recombination (DR) of molecular ions with electrons is a complex, poorly understood molecular process. Its critical role as a neutralising agent in the Earth's upper atmosphere is now well established and its occurrence in many natural and laboratory-produced plasma has been a strong motivation for studying the event. In this book theoretical concepts, experimental methodology and applications are united, revealing the governing principles behind the gas-phase reaction. The book takes the reader through the intellectual challenges posed, describing in detail dissociation mechanisms, dynamics, diatomic and polyatomic ions and related processes, including dissociative excitation, ion pair formation and photodissociation. With the final chapter dedicated to applications in astrophysics, atmospheric science, plasma physics and fusion research, this is a focused, definitive guide to a fundamental molecular process. The book will appeal to academics within physics, physical chemistry and related sciences.

Dissociative Recombination, Theory, Experiment And Applications Iii

Dissociative Recombination, Theory, Experiment And Applications Iii PDF Author: Zajfman Daniel
Publisher: World Scientific
ISBN: 981454857X
Category :
Languages : en
Pages : 268

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Book Description
This book covers the fundamentals of and new developments in gaseous Bose-Einstein condensation. It begins with a review of fundamental concepts and theorems, and introduces basic theories describing Bose-Einstein condensation (BEC). It then discusses some recent topics such as fast-rotating BEC, spinor and dipolar BEC, low-dimensional BEC, balanced and imbalanced fermionic superfluidity including BCS-BEC crossover and unitary gas, and p-wave superfluidity.

Dissociative Recombination of Stored and Phase-spaced Cooled Molecular Ions in CRYRING.

Dissociative Recombination of Stored and Phase-spaced Cooled Molecular Ions in CRYRING. PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9

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Book Description
Ion storage rings offer several advantages for studies of recombination of molecular ions by electrons, a process which in general leads to dissociation. During the last year dissociative recombination of H3, HD, H2+, D2+, 3HeH+, 4HeH+ and 4HeD+ have been studied in storage rings in Stockholm, Heidelberg, Tokyo and Aarhus. Only a fraction of the results obtained at these places have been processed to the point where they have been published in the literature. Hence, the discussion of some of the results in this article must be regarded as tentative.

Dissociative Recombination of Atmospheric Ions

Dissociative Recombination of Atmospheric Ions PDF Author: Annemieke Petrignani
Publisher:
ISBN: 9789077209301
Category :
Languages : en
Pages : 134

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Recombination of Molecular Positive Ions with Electrons

Recombination of Molecular Positive Ions with Electrons PDF Author: M. A. Biondi
Publisher:
ISBN:
Category :
Languages : en
Pages : 32

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Book Description
Results of studies of the recombination of electrons with molecular positive ions are presented. Theoretical arguments indicate that the dissociative process -- in which a molecular ion captures an electron without change of energy, forming an unstable excited molecule which then dissociates -- provides a highly efficient recombination mechanism. The nature of the process responsible for the large recombination rates observed in Laboratory afterglow studies is investigated using combined microwave, optical spectrometric and interferometric, and mass spectrographic techniques. Dissociative recombination is shown to be the process operative in the laboratory studies, since it is found that (a) molecular positive ions must be present to observe a large recombination rate, (b) when diatomic ions are present, excited atoms are formed in the recombination process, and (c) these excited atoms have kinetic energy of dissociation substantially in excess of thermal energy. (Author).

Electron-ion and Ion-ion Dissociative Recombination of Oxygen

Electron-ion and Ion-ion Dissociative Recombination of Oxygen PDF Author: Fui Tak Chan
Publisher:
ISBN:
Category : Ions
Languages : en
Pages : 160

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Computational Methods for Electron—Molecule Collisions

Computational Methods for Electron—Molecule Collisions PDF Author: Franco A. Gianturco
Publisher: Springer Science & Business Media
ISBN: 1475797974
Category : Science
Languages : en
Pages : 364

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Book Description
The collision of electrons with molecules and molecular ions is a fundamental pro cess in atomic and molecular physics and in chemistry. At high incident electron en ergies, electron-molecule collisions are used to deduce molecular geometries, oscillator strengths for optically allowed transitions, and in the case of electron-impact ionization, to probe the momentum distribution of the molecule itself. When the incident electron energy is comparable to or below those of the molecular valence electrons, the physics involved is particularly rich. Correlation and exchange effects necessary to describe such collision processes bear a close resemblance to similar efft:cts in the theory of electronic structure in molecules. Compound state formations, in the form of resonances and vir tual states, manifest themselves in experimental observables which provide details of the electron-molecule interactions. Ro-vibrational excitations by low-energy electron collisions exemplify energy transfer between the electronic and nuclear motion. The role of nonadiabatic interaction is raised here. When the final vibrational state is in the continuum, molecular dissociation occurs. Dissociative recombination and dissociative attachment are examples of such fragmentation processes. In addition to its fundamental nature, the study of electron-molecule collisions is also motivated by its relation to other fields of study and by its technological appli cations. The study of planetary atmospheres and the interstellar medium necessarily involve collision processes of electrons with molecules and molecular ions.

Competition Between Reaction Channels in Electron Collisions of the Hydrogen Molecular Ion HD

Competition Between Reaction Channels in Electron Collisions of the Hydrogen Molecular Ion HD PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
The energy-differential cross-section of dissociative recombination of the HD+ molecular ion (HD+ + e -> H + D) was measured with high precision and on an absolute scale, at the heavy-ion storage ring TSR (Max-Planck-Institut für Kernphysik). The measured cross-section shows a previously unknown structure at electron energies between 1-3 eV, in correlation with the energy thresholds for the opening of additional channels in the dissociation of the intermediate neutral HD molecule. This was explained by autoionization, a process competing with dissociation, and which is related to the number of closed channels. In another experiment, first evidence was observed for vibrational excitation of initially relaxed molecular ions being stored in a heavy-ion storage ring. These processes were attributed to collisions of the stored ions with slow electrons from the ring's electron cooling device, or with molecules from the dilute residual gas in the TSR vacuum system.

Dissociative Recombination

Dissociative Recombination PDF Author: Bertrand R. Rowe
Publisher: Springer Science & Business Media
ISBN: 146152976X
Category : Science
Languages : en
Pages : 282

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Book Description
Proceedings of a NATO ARW held in Saint Jacut de la Mer, Brittany, France, May 3-8, 1992