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2 edition of Excitation and ionization of atomic species by electron impact. found in the catalog.

Excitation and ionization of atomic species by electron impact.

David John Thomas Morrison

Excitation and ionization of atomic species by electron impact.

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Published .
Written in English


Edition Notes

Thesis (Ph. D.)--The Queen"s University of Belfast, 1968.

The Physical Object
Pagination1 v
ID Numbers
Open LibraryOL19929741M

positive and negative ion formation in the glycerol vapour by electron impact: 33 markush pavlo: electron-impact ionization and dissociative ionization of sorbitol in gas phase: 34 markush pavlo: classification of low-energy core excited autoionizing states in barium: 35 markush pavlo: excitation of selenium in gas-phase by electron impact. Processes And Techniques - Processes and techniques Ionization nomenclature Adiabatic ionization A process whereby an electron is either removed from or added to the atom or molecule This term refers to the ionization of any species . Molecular Structure- bonding, shapes, electronic structures. One of the more fundamental issues chemistry addresses is molecular structure, which means how the molecule’s atoms are linked together by bonds and what the inter-atomic distances and angles are.


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Excitation and ionization of atomic species by electron impact. by David John Thomas Morrison Download PDF EPUB FB2

Electron Impact Ionization: Electron impact ionization (ei) is by far the most commonly used ionization method. The effluent from the GC enters a partially enclosed ion source. Electrons “boiled” from a hot wire or ribbon (filament) are accelerated typically by 70 V (and thus have 70 eV of energy) before entering the ion source through a.

To use electron impact excitation of ground state atoms most efficiently, the incident electron energy W e should be picked so as to maximize the cross section at the ionization limit, i.e., to maximize σ′(W e).In general these energies are from 10 to eV.

Typical values of σ′(W e) are ∼1 Å 2, and for reference the values of σ′(W e) for the rare gas atoms are given in Table I [6]. It is perhaps surprising that a process which was one of the first to be studied on an atomic scale, and a process which first received attention over seven decades ago, continues to be the object of diverse and intense research efforts.

Such is the case with the (seemingly) conceptually simple and familiar mechanism of electron impact ionization of atoms, molecules. Electron ionization (EI, formerly known as electron impact ionization and electron bombardment ionization) is an ionization method in which energetic electrons interact with solid or gas phase atoms or molecules to produce ions.

EI was one of the first ionization techniques developed for mass spectrometry. However, this method is still a popular ionization technique. Electron- and photon-impact atomic ionisation Article in Physics Reports (3) November with Reads How we measure 'reads'. Excitation of the 3sS 3 and 3pP3 states of atomic oxygen has been studied in detail for electron impact energies from to eV by use of a close-coupling approximation.

The elementary processes covered in this volume are: radiative processes of, - and spectroscopic data for, the fusion edge species; electron-impact elastic and inelastic (excitation, ionization, recombination) collision processes with plasma edge hydrogen and impurity atoms and ions; electron-molecule (including molecular ion) collision 5/5(2).

The book also evaluates the theory of excitation and ionization by electron impact; measurement of collisional excitation and ionization cross sections; and spectral line broadening in plasmas.

The selection is a dependable reference for readers interested in atomic and molecular Edition: 1. @article{osti_, title = {Cross-section and rate formulas for electron-impact ionization, excitation, deexcitation, and total depopulation of excited atoms}, author = {Vriens, L and Smeets, A H.M.}, abstractNote = {For electron-induced ionization, excitation, and de-excitation, mainly from excited atomic states, a detailed analysis is presented of the dependence of the cross.

@article{osti_, title = {Studies of the electron-impact ionization cross section of vibrationally excited oxygen employing a shock-heated molecular beam}, author = {Evans, B. and Chang, J.S. and Yau, A.W. and Nicholls, R.W. and Hobson, R.M.}, abstractNote = {The shock-heated molecular-beam technique was used to obtain vibrationally excited oxygen molecules.

5. Collisional Excitation Treated as a Radiative Process Appendix References The Measurement of Collisional Excitation and Ionization Cross Sections 1. Introduction 2. Electron Impact Studies 3. Ion Impact Studies 4. Neutral Impact Studies 5. Electron-Ion Collisions References Spectral Line Broadening in Plasmas 1.

Introduction 2. Basic Book Edition: 1. Get this from a library. Atomic-molecular ionization by electron scattering: theory and applications. [K N Joshipura; Nigel J Mason] -- Comprehensive and up-to-date text in the field of electron scattering and ionization, covering fundamentals, experimental background, quantum scattering theories and applications.

Electron impact. Dolder, “Experimental Aspects of Electron-Impact Ionization and Excitation of Positive Ions,” in Atomic and Molecular Physics of Controlled Thermonuclear Fusion, ed.

Joachain and D. Post, NATO’Advanced Study Institute Series B: Physics, Vol. (Plenum, New York and London, ), pp. –Cited by: 5. Penning ionization is a Excitation and ionization of atomic species by electron impact. book of chemi-ionization, an ionization process involving reactions between neutral atoms or molecules.

The Penning effect is put to practical use in applications such as gas-discharge neon lamps and fluorescent lamps, where the lamp is filled with a Penning mixture to improve the electrical characteristics of the lamps.

Ionization or ionisation, is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons, often in conjunction with other chemical resulting electrically charged atom or molecule is called an tion can result from the loss of an electron after collisions with subatomic particles, collisions with other.

The spectroscopy of the aurora was reviewed in a series of articles appearing in the book Auroral Physics (Meng et al ). Molecular oxygen is the third most abundant species in the auroral region of the thermosphere from 90 to km.

Electron impact on O 2 leads to excitation (a 1 2 g,b g,) and ionization excitation (A u,b4 g−). The. Nuclear Fusion Energy: Requirements include collision rates and cross sections for electron impact excitation, ionization, and dielectronic recombination; atomic-energy levels and wavelengths for identification of impurity elements in fusion plasmas, for plasma diagnostics and modeling, and for calculating plasma-cooling effects due to.

The text covers electron scattering phenomena for diatomic and common molecules, polyatomic molecules and radicals including hydro-carbons, fluoro-carbons and other larger molecules together with relevant radical species in detail. Applications of electron impact ionization and excitation in gaseous or plasma and condensed matter is discussed Cited by: 1.

Stanford Libraries' official online search tool for books, media, journals, databases, government documents and more. Plasma spectroscopy 37 in many ways: the long-range interactions with the charged components of the plasma control the population densities of bound states, shift and broaden energy levels (via the Stark effect), lower the ionization potentials of atomic species and are the cause of continuum radiation emission and the emission of normally for.

Since the early days of modem physics spectroscopic techniques have been employed as a powerful tool to assess existing theoretical models and to uncover novel phenomena that promote the development of new concepts. Conventionally, the system to be probed is prepared in a well-defined state.

Upon a controlled perturbation one measures then. Yet, the simultaneous (coincident) detection of two or more excited species proved to be a serious technical obstacle, in particular for extended electronic systems such as surfaces.

In recent years, however, coincidence techniques have progressed so far as to image the multi-particle excitation spectrum in an impressive detail. Atomic-Molecular Ionization by Electron von Joshipura, K.

- Jetzt online bestellen portofrei schnell zuverlässig kein Mindestbestellwert individuelle Rechnung 20 Millionen Titel. International Symposium ‘‘Atomic Cluster Collisions: Fission, Fusion, Electron, Ion and Photon Impact’’ Andrey V.

Solov’yov1, Jean-Patrick Connerade2, and Walter Greiner3,y 1A. Ioffe Physical-Technical Institute, Russian Academy of Sciences, Polytechnichesk St. PetersburgRussia 2The Blackett Laboratory, Imperial College, London SW7 2BW, UK.

Introduction [2] The work reported here establishes accurate cross sections for electron impact ionization‐excitation of N 2 X 1 Σ g + (0) molecules into the N 2 + X 2 Σ g + (v), A 2 Π u (v), and B 2 Σ u + (v) states through analysis of existing extensive published experimental data.

The methodology is based on (1) the calculation of accurate analytic electron impact cross section Cited by: First Born triple differential cross sections (TDCS) for ionization of metastable 3P-state hydrogen atoms by electrons are calculated for various kinematic conditions in the asymmetric coplanar geometry.

A multiple scattering theory is used in this study. The present results are compared with other existing related theoretical results for ionizations of hydrogen atoms from metastable 2S Cited by: 3.

This book comprises selected peer-reviewed papers presented at the 7th Topical Conference of the Indian Society of Atomic and Molecular Physics, jointly held at IISER Tirupati and IIT Tirupati, India, and addresses current topics of interest in atomic and molecular physics.

Atomic Data Evaluation. We have made extensive calculations and a detailed evaluation of both Einstein transition probabilities and electron collision excitation cross sections concerning the 4s and 4p Ar I levels and also those constituting the next configurations 3/4d, 5s, and 5p [].Thus, recommended values for the data needed in various applications have been by: 4.

In atomic emission spectrometry (AES), a source will have actually two roles: 1st step consists of the atomization of the sample to be analyzed so as to obtain free analyte atoms, usually in the ground state, 2nd step consists of a partial ionization of the analyte atoms, and of the excitation of the atoms and the ions to higher-energy states.

Pages in category "Gold Book term" The following pages are in this category, out of total. Ni iv lines can be used as diagnostics for temperature and density for various astrophysical objects.

In addition, ionization of Ni2+ is one of the causes of the opacity in the interstellar medium. We calculate the photoionization of Ni2+ and the electron-impact excitation of Ni3+. We use a fully-relativistic Dirac Atomic R-Matrix Code (DARC) method. We include a large set of Author: Luis Fernández-Menchero, Catherine A.

Ramsbottom, Connor P. Ballance. The book goes on to describe the problems of electron-cluster collisions with special emphasis on polarization and collective excitation effects. The important area of the behavior of atomic clusters in laser fields is considered; the ionization, collective dynamics of electrons in the system in the presence of the laser field, and the laser.

The electron–ion coincidence technique was also applied to study the K shell excitation of nitrogen and carbon monoxide by electron impact. The study of the ionization of N 2 and CO by 10 keV electrons as a function of the energy loss was done by El-Sherbini and van der Wiel for the valence electrons [24] as well as for inner-shell electrons Cited by: In weakly ionized plasmas of gas discharges, electron collisions with neutral species dominate over Coulomb inter-actions among charged particles.

These collisions include elastic collisions, inelastic collisions (leading to excitation of atoms and molecules), and direct ionization by electron impact. The energy quantum of excitation electronically.

An abundance of absorption and emission lines of iron-peak species such as Fe I and Fe II can be seen in the spectra of many astrophysical objects. Thus, the accurate modelling of such spectra requires sets of high quality atomic data for these species.

In this paper, we present preliminary results from the present electron-impact excitation calculations for Fe II and fine Cited by: 1. The goals of atomic, molecular, and optical physics (AMO physics) are to elucidate the fundamental laws of physics, to understand the structure of matter and how matter evolves at the atomic and molecular levels, to understand light in all its manifestations, and to create new techniques and devices.

NIST Electron-Impact Cross Section for Ionization and Excitation This database provides total ionization cross-sections of molecules by electron impact, cross-sections for some atoms, and energy distributions of ejected electrons for H, He, and H 2.

Read More SRD NIST Handbook of Basic Atomic Spectroscopic Data. associative ionization associative surface reaction asymmetric film atmosphere atmospheric pressure ionization atom–molecule complex mechanism atomic mass atomic number atomic orbital atomic weight attenuance attenuation coefficient atto attractive potential-energy surface attractive–mixed–repulsive classification auto-ionization.

"The Excitation of Atomic Hydrogen From n to n + 1 by Electron Impact", by M. Flannery, Astrophys. Letters 6, (). "Semi-Quantal Theory of. Additionally, electron excitation in clusters arising from short laser pulses can contribute to the formation of highly charged species.

Examples of each of these potentially important processes will be discussed, with attention focused on quantifying the cluster properties and laser excitation responsible for their dominance.

III. Electron collisions with molecules 1. Frank-Condon principle 2. Dissociation 3. Dissociative ionization 4. Dissociative recombination 5. Dissociative electron attachment 6. Electron impact detachment 7.

Vibrational and rotational excitation IV. Heavy particle collisions V. Gas phase kinetics PART B5: PLASMA DIAGNOSTICS.Provides a comprehensive description of mass spectrometry basics, applications, and perspectives Mass spectrometry is a modern analytical technique, allowing for fast and ultrasensitive detection and identification of chemical species.

It can serve for analysis of narcotics, counterfeit medicines, components of explosives, but also in clinical chemistry. Neutral Impact Ionization - Thermal Ionization This is also similar to electron-impact ionization but is simply neutral-impact ionization.

The kinetic energy of a gas molecule can be approximated by M ∼ 3 kB T where kB is the Boltzmann constant 2 (kB = × 10−5 eV /K) and T is the gas temperature.