<i>Electronic and atomic collisions: invited papers</i>edited by J. Eichler, I. V. Hertel and N. Stolterfoht

Robertson, J.H.

doi:10.1107/s0108767384001616

Cited by 2 publications

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“…Since then it has developed into a very flourishing and stimulating branch of atomic collision physics. Several reviews on the subject give a comprehensive survey on the present status of this field of research (Blum and Kleinpoppen 1979, 1983a, b, Andersen and Nielson 1982, Slevin 1984, Andersen and Neitzke 1984. Briefly, these experiments are very similar to the method of perturbed angular correlations in nuclear physics.…”

Section: General Context and Some Recent Developrnents In Collision P...mentioning

confidence: 99%

Angular momentum transfer and charge cloud alignment in atomic collisions: intuitive concepts, experimental observations and semiclassical models

Hertel¹,

Schmidt²,

Bähring³

et al. 1985

Rep. Prog. Phys.

156

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We discuss intuitive concepts to describe alignment and orientation effects in collision processes with, or leading to, an atomic np state. For direct excitation one can understand the atomic angular momentum transferred in terms of a rolling ball, and for excitation (de-excitation) in a molecular picture one can 'visualise the alignment angle of the atomic p charge cloud in terms of a transition from a body-fixed molecular picture (small internuclear distances R ) to a space-fixed picture (large R ) . These concepts are illustrated by experimental results for e + Na" and Na+ + Na" collisions.Semiclassical theory is discussed for both the direct and the molecular inelastic processes, giving a theoretical foundation for these models. Detailed results are reported for the time development of the charge cloud in Na++Na* collisions as a model case, illustrating the concept of body-fixed versus space-fixed electron motion and its limitations. Further examples are the molecular process NZ+Na* and the atomic process Xe + Ba" at thermal energies. In all cases long-range rotational (E-II) coupling determines the charge cloud motion.

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Section: General Context and Some Recent Developrnents In Collision P...mentioning

confidence: 99%

Angular momentum transfer and charge cloud alignment in atomic collisions: intuitive concepts, experimental observations and semiclassical models

Hertel¹,

Schmidt²,

Bähring³

et al. 1985

Rep. Prog. Phys.

156

View full text Add to dashboard Cite

show abstract

“…The Ar + ions registered by the mass spectrometer can be the result of ionization in the mass spectrometer ionizer of both the single atoms and clusters due to intensive boiling of clusters after ionization. Haberland [15,16] has shown that, after electron impact ionization of a rare gas cluster, the positive charge, which is delocalized at first, is localized after about 10 −12 s in a dimer ion. The relaxation of its binding energy (about 1 eV) can lead to the cluster fragmentation.…”

Section: Argon Pulsed Jets In the Distant Zonementioning

confidence: 99%

Time evolution of pulsed supersonic jets of argon clusters

Malakhovskii¹

2000

J. Phys. D: Appl. Phys.

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The correlation between cluster decomposition and the structure of pulsed supersonic jets of argon clusters is analysed. The longitudinal and transverse space structures of short supersonic pulses ( 0.5 ms) of argon clusters have been studied far from the skimmer, by a movable mass spectrometer and near the skimmer, by an electron impact ionizer, depending on the stagnation pressure. It has been found that the pulses consist of two distinct fractions of clusters, light and heavy, which are also differently localized in space. The heavy fraction is located inside the pulses and the light fraction is mainly found in the outlying area of the pulses. It has been shown that neutral clusters reveal instability for a long period of time (~0.6 ms) after condensation. This instability results in additional divergence of the cluster beam. Therefore, the change of the cluster beam cross section as a function of the pressure correlates with the corresponding change in the cluster instability.

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Electronic and atomic collisions: invited papersedited by J. Eichler, I. V. Hertel and N. Stolterfoht

Cited by 2 publications

References 0 publications

Angular momentum transfer and charge cloud alignment in atomic collisions: intuitive concepts, experimental observations and semiclassical models

Angular momentum transfer and charge cloud alignment in atomic collisions: intuitive concepts, experimental observations and semiclassical models

Time evolution of pulsed supersonic jets of argon clusters

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