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Lee, D.H.; Richard, Patrick; Zouros, T. J. M.; Sanders, J. M.; Shinpaugh, J. L.; Hidmi, H. I.

doi:10.1103/physreva.41.4816

Cited by 190 publications

(52 citation statements)

References 26 publications

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“…the soft collision, two center effect, binary encounter and electron capture in continuum [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Since the two indistinguishable H-atoms may be termed as a coherent source of electrons in a large impact parameter collision with a fast projectile, their contributions to the ionization add coherently and an interference effect may be expected and has been observed [1,2].…”

Section: Introductionmentioning

confidence: 99%

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H₂Under Fast Ion Impact

Misra¹,

Kelkar²,

Tribedi³

2007

J. Phys.: Conf. Ser.

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Forward backward asymmetry in electron emission from H 2 by fast carbon ions and Young type interference effect D Misra, A H Kelkar, U Kadhane et al. Abstract.We have investigated the double differential distribution of electron emission from molecular hydrogen in collisions with fast bare carbon ions in order to investigate the effect of Young type interference on the forward-backward angular asymmetry. The asymmetry parameter, derived from the cross sections for complementary forward and backward angles, shows an oscillatory behaviour as a function of electron velocity which is absent in atomic target such as He. It is shown that the asymmetry parameter which is based on the DDCS of H 2 only, can be used as self normalizing way of the obtaining the Young type interference in an inversion symmetric homo-nuclear diatomic molecule like H 2 . The measured energy and angular distributions as well as the asymmetry parameter are compared with a molecular CDW-EIS (continuum distorted wave-eikonal initial state) model. IntroductionThe recent observation of Young type interference in ion-impact ionization of diatomic molecule H 2 [1,2] unfolds yet another important aspect of ion-atom ionization besides the well known mechanisms i.e. the soft collision, two center effect, binary encounter and electron capture in continuum [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Since the two indistinguishable H-atoms may be termed as a coherent source of electrons in a large impact parameter collision with a fast projectile, their contributions to the ionization add coherently and an interference effect may be expected and has been observed [1,2]. Several aspects of this process is a subject of interest of various recent theoretical and experimental investigations . Since the double differential cross section (DDCS) varies over several orders of magnitudes in an energy range of few hundred eV, it becomes difficult to observe a small variation in the DDCS spectrum owing its steep variation. Therefore, to enhance the visibility of the structure, the molecular cross sections are divided by the corresponding atomic cross sections, which are either obtained theoretically [1] or in an experiment with atomic H [2]. We have now demonstrated [41] an independent way of obtaining the interference structure by using the forward backward asymmetry parameter of electron DDCS which is independent of the theoretical model calculations and does not require a complementary experiment with atomic H. The experiments with atomic H as a target become difficult owing to the involved procedure of production of atomic H from the dissociation of H 2 . It is known that a large forward backward angular asymmetry is mainly caused by the two-center mechanism in heavy ion collisions [5][6][7][8][9][10][11][12][13][14]. The enhancement in the forward directions and depletion in the backward angles is caused by the long range post collisional interaction among the three particles

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Section: Introductionmentioning

confidence: 99%

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H₂Under Fast Ion Impact

Misra¹,

Kelkar²,

Tribedi³

2007

J. Phys.: Conf. Ser.

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“…However, a detailed investigation of the BE peak shows the influence of the projectile field (and to a lesser extent also of the target field) on the ejected electron. The fields cause a change in intensity and a shift of the peak maximum to lower energies [4,5,8,31]. Fig.…”

Section: The Binary Encounter Peakmentioning

confidence: 93%

“…This theory is often termed impulse approximation [4,35], which is misleading because it includes only the first-order term in the IA, Eq. (17), and not the second-order term.…”

Section: The Binary Encounter Peakmentioning

confidence: 99%

“…Since for such fast electrons the final-state interaction with the target field is rather weak, the gross features of the BE peak can be reproduced with the plane wave Born approximation. However, a series of recent experimental investigations on the precise peak position [4,5] and the discovery of a double-peak structure for very heavy projectiles [6,7] demonstrate that the final-state interaction with the projectile cannot be neglected [8].…”

Section: Introductionmentioning

confidence: 99%

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The importance of continuum eigenstates in electron spectroscopy

Jakubaßa-Amundsen¹

1994

Nuclear Instruments and Methods in Physics Research Section B:

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The four characteristic features in the electron spectra from fast ion-atom collisions, the soft electron peak, the cusp, the electron loss peak and the binary encounter peak are strongly influenced by one or both of the atomic (or ionic) potentials acting on the electron, calling for a nonpertu~ative treatment of the respective final-state interaction. Recent experimental results concerning the peak as~met~ and peak structures are reviewed and interpreted within the available theoretical models.

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“…(6) is better illustrated in Fig. (7), which compares the computed and measured (12) DDCS at zero degrees for the ionization of He by 1.5 MeV proton impact. The calulations use Eq.…”

Section: Vt(s + J) Exp[i(s + J)r] (5)mentioning

confidence: 99%

Electron transfer to continuum states

Macek¹

1996

AIP Conference Proceedings

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O S -r ,Gene Rudd's analysis of doubly differential crom sections for the ionization of He atoms by proton impact suggested that electrons were being carried along by the proton for a short period of time after being ejected fiom the target region. Normally, this would represent an electron capture event in which an excited state of atomic hydrogen is formed. Because the electron ends up ionized it was recognized that these states of the proton must be continuum states. This insight was confirmed by observations of the continuum electron capture (CEC) cusp when the electron velocity equals the proton velocity in the final state. The impact of this idea upon the theory of ionization at high enereies is reviewed.

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Binary-encounter electrons observed at 0° in collisions of 1–2-MeV/amuH+,C6+

Cited by 190 publications

References 26 publications

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H₂Under Fast Ion Impact

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H₂Under Fast Ion Impact

The importance of continuum eigenstates in electron spectroscopy

Electron transfer to continuum states

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Binary-encounter electrons observed at 0° in collisions of 1–2-MeV/amuH+,C6+

Cited by 190 publications

References 26 publications

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H2Under Fast Ion Impact

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H2Under Fast Ion Impact

The importance of continuum eigenstates in electron spectroscopy

Electron transfer to continuum states

Contact Info

Product

Resources

About

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H₂Under Fast Ion Impact

Young Type Interference Effect on the Forward-Backward Asymmetry Parameter in Electron Emission from H₂Under Fast Ion Impact