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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�
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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)
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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
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