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AbstractAbstract
[en] The spontaneous radiation of electrons in planar and axial channeling has been investigated theoretically in crystals with a superlattice under resonance conditions when the energy difference of two levels of the transverse motion in the averaged potential of the channel is approximately equal to a multiple of 2πhc/l, where l is the period of the superlattice along the channel axis. It is shown that the total energy levels of the electrons are split under the action of the spatially periodic perturbation. This changes the spectral and angular characteristics of the radiation substantially. In particular, resonance splitting of individual bands of the quasicharacteristic radiation is predicted. The magnitude of this splitting is estimated. It is established that there is no observable splitting in the channeling of positrons
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Cover-to-cover translation of Zhurnal Ehksperimental'noj i Teoreticheskoj Fiziki (USSR).
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Journal Article
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Geguzin, Ya.E.; Fajnshtejn, A.L.
Proceedings of the 7. International conference on atomic collisions in solids. V. 11981
Proceedings of the 7. International conference on atomic collisions in solids. V. 11981
AbstractAbstract
[en] Briefly reviewed are the papers in which a new method of structural investigation of crystals-protonography has been develope in recent years. The method is based on the application of channeling and shadow effects. It is noted that the analysis of linear and point reflexes of the protonograms on the light testifies to the fact that they have fine structure. This peculiarity of the protonograms can give additional data on defects of the crystal lattice. A table of the basic characteristics of the structural analysis methods is presented
[ru]
Original Title
Ispol'zovanie dlya strukturnykh issledovanij kristallov ehffekta kanalirovaniya i soputstvuyushchikh yavlenij, obnaruzhivayushchikhsya na protonogrammakh
Source
Moskovskij Gosudarstvennyj Univ. (USSR); 308 p; 1981; p. 119-122; 7. International conference on atomic collisions in solids; Moscow, USSR; 19 - 23 Sep 1977; 11 refs.; 1 fig.; 1 tab. -.
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Miscellaneous
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Khuukhenkhuu, G.; Chadraabal, I.; Unenbat, G.
Funding organisation: Mongolian National Univ., Ulan Bator (Mongolia). Nuclear Research Lab1996
Funding organisation: Mongolian National Univ., Ulan Bator (Mongolia). Nuclear Research Lab1996
AbstractAbstract
[en] The possibilities of applications of the 200 KeV Cockcroft-walton accelerator for D-D neutron measurements, ion implantation, Rutherford backscattering analysis, ion channeling and proton induced X-ray analysis are discussed
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Laboratory for Nuclear Research, State University of Mongolia Ulaanbaatar
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AbstractAbstract
[en] Theory of P-noninvariant rotation of spin of charged particles, channeled in straight crystals was constructed. Quantitative description of the effect was conducted
Original Title
Povorot spina zaryazhennykh chastits v kristallakh, obuslovlennyj P-neinvariantnym vzaimodejstviem
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Tyshchenko, M.H.; Kolesnichenko, Ya.I.; Lutsenko, V.V.; Yakovenko, Yu.V.
Book of abstract of 15th annual scientific conference of Institute for Nuclear Research of National Academy of Sciences of Ukraine2018
Book of abstract of 15th annual scientific conference of Institute for Nuclear Research of National Academy of Sciences of Ukraine2018
AbstractAbstract
No abstract available
Primary Subject
Source
Natsyional'na Akademyiya nauk Ukrayini, Kyiv (Ukraine); Yinstitut Yadernikh Doslyidzhen', NAN Ukrayini, Kyiv (Ukraine); 240 p; 2018; p. 165-166; 15. annual scientific conference of Institute for Nuclear Research of National Academy of Sciences of Ukraine; Tezi dopovyidej 15 shchoryichnoyi naukovoyi konferentsyiyi Yinstitutu Yadernikh Doslyidzhen' Natsyional'noyi Akademyiyi Nauk Ukrayini; Kyiv (Ukraine); 16-20 Apr 2018; Available from Ukrainian INIS Centre
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Related RecordRelated Record
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Ashley, J.C.; Ritchie, R.H.
Oak Ridge National Lab., Tenn. (USA)1977
Oak Ridge National Lab., Tenn. (USA)1977
AbstractAbstract
[en] Theoretical models are presented based on the impact parameter picture for the energy losses of channeled ions. The conceptual simplicity afforded by such an approach is quite appealing. In addition, it is found that calculations based on these models provide reasonable predictions for, and agreement with, a variety of experimental data. A useful approach is provided for meeting the challenges to theory afforded by experimental measurements on channeling phenomena
Original Title
Impact parameter
Source
1977; 16 p; 7. international conference on atomic collisions in solids; Moscow, USSR; 19 - 23 Sep 1977; Available from NTIS., PC A02/MF A01
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Report
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AbstractAbstract
[en] The model used by Briggs and Pathak to calculate the electronic energy loss of low-velocity channeled heavy ions has been explored further to study the velocity dependence of Z1 oscillations in electronic stopping power. For increasing ion velocities, where the validity of neglecting the target-electron velocities increases, it is found that the magnitude of Z1 oscillations decreases and by about 2-a.u. velocity the first maxima at Z1=6 and the first minima at Z1=10 are washed out completely
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Journal Article
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Physical Review. B, Condensed Matter; ISSN 0163-1829;
; v. 22(1); p. 96-98

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AbstractAbstract
[en] Electronic stopping powers S of solids for penetrating ions are analyzed on the basis of effective-charge theory, and comprehensive comparisons are made to available data for random stopping. The effective projectile-ion charges Z/sup asterisk/1e, extracted from the data agree to within experimental uncertainties with those calculated in a statistical model, for projectile atomic number ranging from Z1 = 1 to Z1 = 92 and for projectile velocity v1 > or approx. = v0 equivalent e2/h. The rise of Z/sup asterisk/1 with v1 fully accounts for an often-quoted apparent deviation of heavy-ion stopping power from the behavior expected in the limit v1 → 0. The Bloch and the Z31 corrections to the usual formula for S are calculated and found to make no appreciable contribution to presently available data, save possibly to one bromine datum. When v/sub o/ 9 or approx. = v1 9 or approx. = 3v0 the analysis requires, and provides, and empirical velocity-dependent proton effective charge Z/sup asterisk//sub p/e. A theoretical account of Z/sup asterisk/p is given in terms of velocity and energy criteria for electron stripping. Thomas-Fermi densities for heavy ions are used to calculate Z/sup asterisk/1. Our results lead to an interpolation linear in v1 for the range 0 < or = v1 9 or approx. = v/sub o/ which gives satisfactory values for S in this low-velocity regime
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Journal Article
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Phys. Rev., B; v. 17(9); p. 3473-3483
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Haymann, P.
Electron and ion beam processes applications. 4. International congress AVISEM 74. Toulouse, October 8-11, 19741974
Electron and ion beam processes applications. 4. International congress AVISEM 74. Toulouse, October 8-11, 19741974
AbstractAbstract
[en] A theory recently developed by the authors for slow and fast electrons is shown to be also applicable to channeled ions and to explain the experimental results about electron loss phenomena as a whole. The theory is based on the fundamental hypothesis of the nonadiabaticity of the ion-target interactions. How essential an exponential form of the interaction pseudo-potential is in explaining the energy exchange mechanism at the walls may be deduced from a quasi-classical development of the quantum model. The theory also allows a number of new experiments to be envisaged in the field of surface electron states
[fr]
On montre qu'une theorie recemment developpee par les auteurs pour les electrons lents et pour les electrons rapides s'applique egalement aux ions canalises et permet de rendre compte de l'ensemble des resultats experimentaux concernant, les phenomenes des pertes electroniques. La theorie est basee sur l'hypothese fondamentale de non adiabaticite des interactions ion-cible. Un traitement quasi-classique du modele quantique permet de comprendre pourquoi une forme exponentielle pour le pseudo-potentiel d'interaction est essentielle pour expliquer le mecanisme des echanges energetiques au niveau des parois. Cette theorie permet egalement de prevoir un certain nombre d'experiences nouvelles dans le domaine des etats electroniques de surfaceOriginal Title
Etude theorique du pouvoir d'arret electronique en canalisation planaire des ions
Source
p. 75-84; Oct 1974; Societe Francaise du Vide; Paris, France; 4. International congress AVISEM 74. Application of electronic and ionic processes; Toulouse, France; 08 Oct 1974
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Book
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AbstractAbstract
No abstract available
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Journal Article
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Physics Letters. A; v. 53(3); p. 231-232
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