Emission of Auger Electrons Resulting from Symmetric Argon and Neon Ion-Atom Collisions

Cacak, Robert K.; Kessel, Q. C.; Rudd, M. E.

doi:10.1103/physreva.2.1327

Cited by 106 publications

(10 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Absolute Auger cross sections were obtained by normalizing the Ar L Augerline intensity after a smooth background substraction in 100-keV Ar + -* Ar collisions to measured cross sections. 3 In addition in many instances our data for singly charged projectiles could be compared with the results of others 6 ' 10 ; in general the agreement was within 10%. Since we are interested in total K-shell-ionization cross sections, we have summed the cross sections for target and projectile.…”

supporting

confidence: 68%

“…A series of calculations 2 of if-shell-vacancy production via rotational coupling of the 2pv-2pir MO proved to be in agreement with the measured K-shell-vacancy production cross sections. 3 K-shell-vacancy production cross sections in Ne-* CH 4 ,N 2 ,0 2 ,Ne and N--CH 4 ,N 2 ,0 28 Ne collisions are measured for incident charge states 1 + to 4 + and 1 + to 3 + , respectively, in the projectile energy range 50 to 500 keV. The data indicate there is a real deviation between experiment and the calculations of rotational-coupling cross sections.…”

mentioning

confidence: 90%

See 1 more Smart Citation

Charge-State Dependence ofK-Shell-Vacancy Production Cross Sections in Slow Ion-Atom Collisions

et al. 1977

View full text Add to dashboard Cite

one count an hour c This is close to being reasonable, since much of the desired phase space could be collected simultaneously,, We conclude that the K + meson would theoretically provide an excellent probe of the deep hole states via knockout. The effects of distortion should be much less than in (p, 2p) reactions. The cross sections are larger than those observed in (e,e'p) reactions, but the availability of highflux electron beams tends to give the electron reaction the advantage at the present time. Fluxes of K* mesons of the order of 10 7 -10 8 per second would make this experiment possible and would add a valuable tool to our current collection of probes of the nucleus.We would like to thank Carl Dover, Phil Roos, and Phil Steinberg for useful discussions. The computing time provided by the Ohio University Computer Center is gratefully acknowledged,, One of us (R.D.K.) would like tcr acknowledge the hospitality of the University of Maryland, where some of this work was performed. This work was supported in part by the National Science Foundation and the U. S. Energy Research and Development Administration. 1 G. Jacob and Th. A. J. Maris, Rev. Mod. Phys. 45,In low-velocity ion-atom collisions the production of if-shell vacancies via rotational coupling of the 2p(j-2pTi molecular orbitals (MO), transiently formed during the collision, has been an area of extensive investigation. From the beginning of these studies one of the best evidences for the molecular picture of these collisions was the dependence of the inner-shell-vacancy production on the charge state of the incident projectile. For example, in Ne-~Ne collisions the cross section 6 (1973); private communication.15 P. G. Roos, private communication.was predicted and observed to double in going from 1 + to 2 + projectiles. 1 This was in agreement with the MO picture since the number of 2pn vacancies, and hence the K-shell-vacancy production cross section, was predicted to be proportional to the projectile charge state. A series of calculations 2 of if-shell-vacancy production via rotational coupling of the 2pv-2pir MO proved to be in agreement with the measured K-shell-vacancy production cross sections. 3 However, as K-shell-vacancy production cross sections in Ne-* CH 4 ,N 2 ,0 2 ,Ne and N--CH 4 ,N 2 ,0 28 Ne collisions are measured for incident charge states 1 + to 4 + and 1 + to 3 + , respectively, in the projectile energy range 50 to 500 keV. The data indicate there is a real deviation between experiment and the calculations of rotational-coupling cross sections. The data suggest that the deviations are not due to a nonstatistical distribution of the 2p vacancies among the 2p-n molecular orbital or a velocity-dependent coupling N(v) as has been previously assumed. 1322

show abstract

supporting

confidence: 68%

mentioning

confidence: 90%

Charge-State Dependence ofK-Shell-Vacancy Production Cross Sections in Slow Ion-Atom Collisions

et al. 1977

View full text Add to dashboard Cite

show abstract

“…A simple model has been used to derive rp values from the xray cross sections [22]. It assumes that there is a constant probability P that an electron hole is created in the shell when the trajectory has an impact parameter less than bp and.…”

Section: Discussionmentioning

confidence: 99%

Z1oscillations in yields of multicharged ions emitted from a germanium surface when bombarded by light ions

1995

View full text Add to dashboard Cite

The interaction radii at which holes are created in the L shell of light projectiles and in the M shell of germanium during ionsurface-atom collisions have been determined from the thresholds for doubly charged ion production. In contrast to the data with a silicon target, the interaction radius at which electron promotion occurs does not decrease with projectile atomic number Zq, as it should if promotion occurs at a definite level crossing. In addition, the yields of doubly charged ions do not follow the Zi dependence predicted by the Fano-Lichten electron-promotion model [Phys. Rev.

show abstract

“…Cependant, quand l'énergie de collision croît, le maximum d'émission X se déplace vers les numéros atomiques croissants [10], vraisemblablement parce que les électrons externes sont plus fortement excités [12]. Il en résulte aussi une augmentation du rendement de fluorescence [13,14]. Celui-ci reste cependant petit, de l'ordre de I O-3 pour l'argon, et la désexcitation par effet Auger reste de loin la plus probable.…”

Section: Introduction -En 1965 Fano Etunclassified

Émission Auger de l'argon lors du bombardement de divers métaux par des ions A+

Lesegno¹,

Hennequin²

1974

J. Phys. France

View full text Add to dashboard Cite

place du 8 mai 1945, 93206 Saint-Denis, France (Reçu le 25 mars 1974) Résumé. 2014 Les conditions d'observation d'électrons Auger émis par l'argon lors du bombardement de cibles solides par des ions A+ sont étudiées et précisées dans le cas de métaux (K, Ca, Sc, Ti, V, Cr) bombardés par des ions A+ jusqu'à une énergie de 15 keV. L'énergie des ions A+ doit dépasser une énergie seuil qui dépend de la cible et qui est de l'ordre d'une dizaine de keV pour les métaux étudiés. Comme pour des collisions en phase gazeuse, ces conclusions s'interprètent par la possibilité de transitions électroniques aux croisements des orbitales moléculaires formées au cours de la collision. Abstract. 2014 The conditions for Auger electron emission from argon during ion bombardment of solid targets by Ar+ ions are studied for the case of metals (K, Ca, Sc, Ti, V, Cr) bombarded by Ar+ ions at energies lower than 15 keV. The Ar+ ion energy must exceed a threshold value which depends on the target and is of the order of 10 keV for the metals studied. Analogous to gaseous collisions, the results indicate that electronic transitions are effective at crossings of the molecular orbitals created during the collision.

show abstract

Emission of Auger Electrons Resulting from Symmetric Argon and Neon Ion-Atom Collisions

Cited by 106 publications

References 13 publications

Charge-State Dependence ofK-Shell-Vacancy Production Cross Sections in Slow Ion-Atom Collisions

Charge-State Dependence ofK-Shell-Vacancy Production Cross Sections in Slow Ion-Atom Collisions

Z1oscillations in yields of multicharged ions emitted from a germanium surface when bombarded by light ions

Émission Auger de l'argon lors du bombardement de divers métaux par des ions A+

Contact Info

Product

Resources

About