Interference effects due to projectile target nucleus scattering in single ionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>75</mml:mn><mml:mtext>−</mml:mtext><mml:mi>keV</mml:mi></mml:mrow></mml:math>proton impact

Alexander, Jason; LaForge, Aaron; Hasan, A.; Machavariani, Z. S.; Ciappina, M. F.; Rivarola, R D; Madison, Don H.; Schulz, Michael

doi:10.1103/physreva.78.060701

Cited by 54 publications

(74 citation statements)

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“…If, on the other hand, L is large enough so that Δr > D the projectile is coherently scattered, which can result in an observable interference pattern. Such structures have been predicted several decades ago [17] and reported recently [18,19]. 1 1 Interferences in the electron energy spectra due to coherent ejection from the two atomic centers were also reported [e.g.…”

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Manipulating Atomic Fragmentation Processes by Controlling the Projectile Coherence

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“…Therefore, all ionization events leading to scattering angles between 0 and 1.5 mrad were recorded simultaneously. Data were taken for a fixed projectile energy loss ΔE of 30 eV where a pronounced interference structure was observed earlier [19]. The projectile detector was set in coincidence with the recoil-ion detector.…”

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Manipulating Atomic Fragmentation Processes by Controlling the Projectile Coherence

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“…This double-slit interference effect modulates the energy spectrum of the ejected electron [14] and it affects also the angular distribution of the scattered projectile [15,16]. For a coherence length smaller than the internuclear separation D = 1.6 a.u., one does not expect interference effects.…”

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Loss of wave-packet coherence in ion-atom collisions

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The projectile beam coherence effects occurring in ion-atom collisions are analyzed on the basis of the recent theory of Karlovets et al. [Phys. Rev. A 92, 052703 (2015)] developed for the elastic scattering of wave packets of particles off a potential field. This theory is generalized to estimate the loss of coherence for inelastically scattered projectiles in ionizing collisions. The results obtained by the suggested model are compared with experimental data for the ionization of hydrogen atoms and molecules by 75-keV proton impact. Significantly improved agreement is observed between the theory and experiment. DOI: 10.1103/PhysRevA.93.032702 In a recent work Karlovets et al.[1] investigated theoretically the scattering of wave packets of nonrelativistic particles off a potential field. The authors derived a simple general expression that determines the number of scattering events for the case when the incident particle beam is a wave packet of arbitrary form but with its mean momentum strongly centered at a given value p i . Furthermore, they considered the example when the wave packet is scattered off randomly distributed potential centers. By averaging the number of events over the impact parameter between the potential center and the wave packet axis, they derived a formula for the effective cross section that reproduces the one obtained by previous authors (see, e.g., [2,3]where dσ /d | q i →q f is the differential cross section for the elastic scattering in an angle θ = arccos(q i ·q f ). Furthermore, by writing (k) = ⊥ (k ⊥ ) (k ), with strongly centered on p i , they obtainedKarlovets et al. carried out sample calculations for the case of electron impact, applying the Born approximation. They considered the collisions of a Gaussian wave packeton a Gaussian potential as well as on the hydrogen atom. Here σ ⊥ is the averaged transverse size of the wave packet. As a remarkable result, they found that the angular distributions of the effective cross section broaden with the decrease of σ ⊥ . [4] could control the coherence properties of the ion beam and thereby demonstrate the effect of the projectile coherence on the angular distribution of the scattered protons. The principle of the experiment is based on the van Cittert-Zernike theorem according to which the transverse coherence length r (the diameter of the area of coherence) of a source of waves at a distance L is of the order of λ/kα, where λ is the wavelength, α is the angular diameter of the source, and k is a dimensionless constant.Egodapitiya et al. used a well-collimated nearly monochromatic [< 1 eV full width at half maximum (FWHM)] proton beam that crossed a molecular hydrogen beam. The measured quantity was the doubly differential cross section (DDCS) for the ionization as a function of the scattering angle θ and the energy loss of the protons. The measurements were made at two coherence length values corresponding to two values of the distance between the target and the last aperture of the collimator, L = 6.5 and 50 cm. The diameter of t...

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“…[1] reported DDCS-P measurements for ionization of H 2 by 75keV proton impact which demonstrated significant structure directly in the projectile angular dependence and this structure was attributed to double slit interference.…”

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“…[1]. Theory: dash-dot atomic H cross sections times an interference factor [1], dash M3DW-EIS times 4.5. Solid M3DW-EIS.…”

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Differential cross sections for single ionization of H₂by 75keV proton impact

Chowdhury

Schulz

Madison

2012

J. Phys.: Conf. Ser.

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Interference effects due to projectile target nucleus scattering in single ionization ofH2by75−keVproton impact

Cited by 54 publications

References 21 publications

Manipulating Atomic Fragmentation Processes by Controlling the Projectile Coherence

Manipulating Atomic Fragmentation Processes by Controlling the Projectile Coherence

Loss of wave-packet coherence in ion-atom collisions

Differential cross sections for single ionization of H₂by 75keV proton impact

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Interference effects due to projectile target nucleus scattering in single ionization ofH2by75−keVproton impact

Cited by 54 publications

References 21 publications

Manipulating Atomic Fragmentation Processes by Controlling the Projectile Coherence

Manipulating Atomic Fragmentation Processes by Controlling the Projectile Coherence

Loss of wave-packet coherence in ion-atom collisions

Differential cross sections for single ionization of H2by 75keV proton impact

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Differential cross sections for single ionization of H₂by 75keV proton impact