HAL Id: hal-01203440
https://hal.sorbonne-universite.fr/hal-01203440
Submitted on 23 Sep 2015
HAL
is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.
L’archive ouverte pluridisciplinaire
HAL, estdestinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Distributed under a Creative Commons
Attribution| 4.0 International LicenseElectron interferences in the ionization of the dimers by swift ion impact: Origin of high-order frequency
H Agueny, A Makhoute, A Dubois, J P Hansen
To cite this version:
H Agueny, A Makhoute, A Dubois, J P Hansen. Electron interferences in the ionization of the dimers
by swift ion impact: Origin of high-order frequency. Journal of Physics: Conference Series, IOP
Publishing, 2015, 635 (3), pp.032094. �10.1088/1742-6596/635/3/032094�. �hal-01203440�
This content has been downloaded from IOPscience. Please scroll down to see the full text.
Download details:
IP Address: 134.157.80.70
This content was downloaded on 22/09/2015 at 13:08
Please note that terms and conditions apply.
Electron interferences in the ionization of the dimers by swift ion impact: Origin of high-order frequency
View the table of contents for this issue, or go to the journal homepage for more 2015 J. Phys.: Conf. Ser. 635 032094
(http://iopscience.iop.org/1742-6596/635/3/032094)
Home Search Collections Journals About Contact us My IOPscience
Electron interferences in the ionization of the dimers by swift ion impact: Origin of high-order frequency
H. Agueny∗,‡ 1, A. Makhoute†, A. Dubois∗, J. P. Hansen‡
∗ Sorbonne Universit´es, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Mati`ere et Rayonnement, F-75231 Paris Cedex 05, France
† UFR de Physique du Rayonnement et des Interactions Laser-Mati`ere, Facult´e des Sciences. Universit´e Moulay Ismail, B.P. 11201, Zitoune, Mekn`es, Morocco
‡Department of Physics and Technology, Allegt. 55, University of Bergen, N-5007 Bergen, Norway Synopsis We report evidence for interference phenomena beyond Young-type in electron emission spectrum from the dimers by fast ions. Prior measurements forH2 have led to a wide discussion for which no definitive conclusions have been settled, whereas theoretical-side have failed to reproduce the phenomenon. The process under investigations is treated by using a nonperturbative semi-classical approach to solve the time-dependent Schr¨odinger equation. Our results are supported by an analytic model based on second- and third-order Born series.
Double-scattering effects were claimed to be observed and evoked to explain additional oscil- latory structures in the measured spectra in fast ion-H
2collisions. The first experimental observa- tions of such additional structures were sparked off further experimental and theoretical efforts to enhance the understanding of the complete na- ture of the phenomenon [1]. In spite of the num- ber of experiences performed in that context, no clear demonstration has been reached [2,
3,4,6].In contrast, theoretical investigations have been unable to reproduce the phenomenon [7,
8]. Thismakes the numerical demonstration of the exis- tence of such effects a real challenge.
During the conference we shall present our results stemming from a nonperturbative ap- proach to solve the time-dependent Schr¨ odinger equation in which all high-order mechanisms are taken into account in the dynamical stage. The purpose is to resolve this controversy and explain why calculations on
H2do not get to any addi- tional features related to high-order interference.
This is achieved by investigating completely dif- ferent energetic ion-molecule collisions, in which a clear footprint of high-order frequency in elec- tron emission spectra is found. As is shown in Fig. 1 the spectrum shows up to four dis- tinct harmonics from the full molecular treat- ment. In contrast, the corresponding results
”2Rb” stemming from a pseudo-molecular model exhibit only first order frequency characteristic of Young-type interference. Our nonperturba- tive calculations are supported by a model de- rived from second- and third-order Born series.
The latter reproduces the spectrum almost per- fectly. We will also report an extension to a tri- atomic linear molecule which reveals additional
and strong harmonics.
0 2 4 6 8
0,0 0,2 0,4 0,6 0,8 1,0
Magnitude (arb. units.)
Frequency (a.u.) Rb Rb+
Figure 1. Frequency distributions from calcula- tions for 63 Mev/u collisions of H+−Rb+2 (black curve) and H+−2Rb (red curve) compared with the Fourier spectrum from the third Born model (blue curve). The model 2Rb is resulting from a coherent sum of the ionization wave-function from two-independent monomers separated by a distance Rab=9.2 a.u.. Inset: Initial Electronic probability density vs. spatial coordinatex(|x|<10 a.u.).
References
[1] N. Stolterfoht et al 2001 Phys. Rev. Lett. 87 023201
[2] N. Stolterfohtet al2004Phys. Rev. A69012701 [3] S. Hossainet al2005Phys. Rev. A72010701 [4] J. A. Taniset al2006Phys. Rev. A74022707 [5] J. L. Baranet al2008Phys. Rev. A78012710 [6] D. Misraet al2009Phys. Rev. A80062701 [7] N. Sisouratet al2007Phys. Rev. A76012718 [8] L. Sælenet al2010Phys. Rev. A81022718
1E-mail: h.agueny@gmail.com
XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC2015) IOP Publishing Journal of Physics: Conference Series 635 (2015) 032094 doi:10.1088/1742-6596/635/3/032094
Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Published under licence by IOP Publishing Ltd 1
