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AbstractAbstract
[en] In this thesis, it is presented the results of the research performed in Resonant Raman effect and Raman effect intensified by surface
[pt]
Nesta tese apresentam-se resultados de pesquisas em efeito Raman ressonante e em efeito Raman intensificado por superficie (SERS)Original Title
Intensificacao do espalhamento Raman por ressonancia e por superficie: principios e aplicacoes
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1986; 52 p; Tese (Livre Doc.).
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Miscellaneous
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Thesis/Dissertation
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AbstractAbstract
[en] The complex Kohn method has been used to obtain photoionization cross sections of N2 leading to the three lowest states of the N2+ ion, (X2Σg+, A2Πu Β2Σu+). The effect of channel coupling and target correlation on both total and differential photoionization cross sections will be discussed. In particular, the level of theory needed to produce reliable cross sections in the 1Πu → kΠg channel and differential cross sections in the (2σu)-1 ionization channel will be presented
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1993 American Physical Society annual meeting on atomic, molecular, and topical physics; Reno, NV (United States); 16-19 May 1993; CONF-9305421--
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AbstractAbstract
No abstract available
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(c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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Gamal Yosr, E.E.D.; Shafik, M.S.; Abdel-Moneim, H.M.
International Centre for Theoretical Physics, Trieste (Italy)1990
International Centre for Theoretical Physics, Trieste (Italy)1990
AbstractAbstract
[en] This paper presents an investigation of the stepwise ionization processes which occur during the interaction of laser radiation with electronegative gases. Calculations are carried out adopting a modified version of the electron cascade model previously developed by Evans and Gamal. The modifications of the model are performed for the case of molecular oxygen to account for electron attachment losses. Particular attention is devoted to molecular oxygen at a pressure of 2.8 x 104 Torr irradiated by 10 ns pulse of Nd:YAG laser (λ=1.064 μm) at a peak intensity of 1.7x1011Wcm-2. The calculations consider the effect of the secondary ionization processes on the electron energy distribution function and its parameters (evolution of the density of the excited molecules, electrons density as well as the electron mean energy during the laser flash). This analysis shows how the removal of slow electrons by attachment to oxygen molecules creates a strong competition between the stepwise ionization processes. These processes namely photoionization and collisional ionization deplete the electronic excited states and contribute eventually to the ionization growth rate in laser induced breakdown of electronegative gases. (author). 7 refs, 6 figs, 1 tab
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Aug 1990; 19 p
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Report
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Compton, R.N.; Callcott, T.A.; Carter, A.
Health Physics Division annual progress report for period ending June 30, 19751975
Health Physics Division annual progress report for period ending June 30, 19751975
AbstractAbstract
[en] Topics covered include: negative ion formation in organic molecules; negative-ion formation in Fe(CO)5 and Ni(CO)4; collisional ionization of Na, K, and Cs by CO2, COS, and CS2, electron affinities; abnormally large electron affinities for some hexafluoride molecules; π-electron affinities for organic molecules; gas phase laser-ion spectroscopy; studies of dissociative ionization by electron impact; ionization potentials of organic donor molecules; reactions of electronically excited atoms; kinetic energy production from unimolecular dissociations; optical and electrical measurements on organic semiconductors; level shifts from coulomb interaction of atoms in a gas; and rotational resonance in low-energy electron-H2 scattering. 24 figures, 3 tables
Original Title
Summary of research activities at ORNL 1974-75
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Oak Ridge National Lab., Tenn. (USA); p. 157-173; Sep 1975
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Report
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Progress Report
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AbstractAbstract
[en] The main features of multiphoton processes are described on a somewhat elementary basis. The emphasis is put on multiphoton ionization of atoms where the influence of resonance effects is given through typical examples. The important role played by the coherence of light is shown to produce a very dramatic influence on multiphoton absorption. Different observations concerning molecules, electrons, as well as solid surfaces illustrate the generality of these very non linear interaction between light and matter. (Auth.)
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333 p; 1980; p. 74-78; Institut fur Atomphysik der Universitat Innsbruck; Innsbruck, Austria; Symposium on atomic and surface physics 80; Salzburg, Austria; 10 - 16 Feb 1980
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Book
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AbstractAbstract
[en] The helium dimer He2 is an extreme quantum system, bound with only 100 neV of binding energy and a widely smeared wavefunction, showing a mean internuclear di stance of 52 Angstroem. We study the photoionization of this quantum system by me ans of the COLTRIMS technique. We find surprisingly efficient mechanisms by whic h a single photon can lead to ejection of two electrons, one from each of the distant atom of the dimer.
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DPG Spring meeting 2010 of the atomic, molecular, plasma physics and quantum optics section (S-AMOP) with the divisions atomic physics, physics education, short time-scale physics, mass spectrometry, molecular physics, plasma physics, quantum optics and photonics, environmental physics; Hannover (Germany); 8-12 Mar 2010; Available from http://www.dpg-verhandlungen.de; Session: A 1.3 Mo 15:00; No further information available; Also available as printed version: Verhandlungen der Deutschen Physikalischen Gesellschaft v. 45(1)
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEAZ; (Hannover 2010 issue); [1 p.]

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AbstractAbstract
[en] The two=photon ionization probability of a simple model of diatomic molecule has been exactly evaluated under the assumption that a perturbative treatment is valid. The model consists of a simple electron in one-dimensional motion in the field of two fixed Dirac delta wells. The exact results are compared with a number of approximations arising from simplifications introduced at the level of final state and/or the intermediate states involved in the evaluation of the relevant ionization amplitude
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Journal Article
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Nuovo Cim., D; CODEN NCSDD; v. 3 (5); p. 917-935
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AbstractAbstract
[en] Photoionization and photon-induced fragmentation of isomeric icosahedral closo-carboranes by monochromatic synchrotron radiation is reported. Vacuum ultraviolet radiation from the 3 m NIM-I beam line at the storage ring BESSY (Berlin) was used for the experiments. This allows us to measure ionization thresholds and fragmentation patterns at various photon energies. In spite of complexities that result because of the natural isotope abundance of boron and photon-induced loss of hydrogen, the distinct mass spectrometry fragmentation patterns have been partially identified. At low photoionization energies, we find that the loss of atomic hydrogen corresponds to even numbers of hydrogen atoms. Distinct differences between the isomers of closo-dicarbadodecaborane (orthocarborane (1,2-C2B10H12), metacarborane (1,7-C2B10H12)), paracarborane (1,12-C2B10H12) are observed indicating that the loss of pairs of hydrogen depends on the carbon placement within the carborane cage. Furthermore, fragmentation of the cage into singly charged fragments of variable mass is observed along with stable doubly charged intact carborane cages. These results are discussed along with plausible fragmentation mechanisms
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2008 DPG spring meeting. Jointly spring meeting of the working group AMOP of the professional associations atomic physics, short time physics, mass spectrometry, molecule physics, plasma physics, quantum optics and photonics and the professional associations hadrons and cores, environmental physics; DPG Fruehjahrstagung 2008. Gemeinsame Fruehjahrstagung des Arbeitskreises AMOP mit den Fachverbaenden Atomphysik, Kurzzeitphysik, Massenspektrometrie, Molekuelphysik, Plasmaphysik, Quantenoptik und Photonik und den Fachverbaenden Hadronen und Kerne, Umweltphysik; Darmstadt (Germany); 10-14 Mar 2008; Also available online: http://www.dpg-tagungen.de/index_en.html; Session: MS 2.7 Mo 18:15; No further information available
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEAZ; v. 43(3); [1 p.]

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AbstractAbstract
[en] Relationship between statistical properties of laser light scattering in Brownian medium and photon-counting distributions are described in detail. A coherence optical detection has been constructed and by using photon-counting technique the ensemble distribution of the scattered field within space and time coherence has been measured. Good agreement between theory and experiment is shown. (author)
Original Title
Statistika hamburan sinar laser pada medium Brownian
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7 refs.
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Journal Article
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Majalah BATAN; ISSN 0303-2876;
; v. 16(4); p. 66-75

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