Ionization of Atomic Hydrogen by 30–1000 keV Antiprotons

Knudsen, H.; Mikkelsen, U.; Paludan, Kirsten; Kirsebom, K.; Møller, S.P.; Uggerhøj, E.; Slevin, J; Charlton, M.; Morenzoni, E.

doi:10.1103/physrevlett.74.4627

Cited by 81 publications

(73 citation statements)

References 13 publications

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“…Again, (7) 1.54 (8) These excitation cross sections are probably largely converged with respect to increasing the maximum principal quantum number n max of the Sturmian basis functions: Cross sections with n max = 30 (previously published for proton impact [1] and given in Table III for antiproton impact at 0.5, 1 MeV, and lower energies) rather than 35 (reported in Antiproton Energy (keV) crosses, two-center Gaussian-pseudostate (Toshima [7]); plus signs, one-center pseudostate (McGovern et al [3]); squares, one-center Sturmian (Igarashi et al [6]). Circles, experimental results of Knudsen et al [21]. Table IV) are the same, save for some differences of one unit in the third digit for 4s,3d,4d.…”

Section: Shown Inmentioning

confidence: 81%

Ionization and excitation in collisions between antiprotons and H(1s) atoms studied with Sturmian bases

Winter

2011

Phys. Rev. A

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Coupled two-center as well as one-center Sturmian cross sections have been determined for ionization and excitation inp-H(1s) collisions atp energies from 1 to 16 000 keV, following the author's recent work for p-H(1s) collisions [Phys. Rev. A 80, 032701 (2009)]. Basis convergence is studied in detail. Results for ionization and excitation are compared to other coupled-state results and to numerical results, as well as limited experimental results for ionization only. Except for the large, two-center coupled-Gaussian-pseudostate calculation of Toshima for ionization only [Phys. Rev. A 64, 024701 (2001)], previous calculations employed one-center bases, including a one-center Sturmian calculation by Igarashi et al. [Phys. Rev. A 61, 062712 (2000)]. A strong contrast with p-H collisions is confirmed at intermediate energies, while at high energies the extent of agreement is revealed between coupled-state results for the two collisional systems, as well as with first Born results.

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Section: Shown Inmentioning

confidence: 81%

Ionization and excitation in collisions between antiprotons and H(1s) atoms studied with Sturmian bases

Winter

2011

Phys. Rev. A

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“…Here we do not have experimental data for collisions with projectile energies below 30 keV (1.1 a.u. in velocity) [10], but there exist a number of theoretical calculations which should be reliable in this case of a very simple target. We choose to plot the so-called ''one-center atomic orbital close coupling calculation'' results of Igarashi et.…”

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confidence: 98%

Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions

et al. 2010

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Low energy antiprotons have been used previously to give benchmark data for theories of atomic collisions. Here we present measurements of the cross section for single, nondissociative ionization of molecular hydrogen for impact of antiprotons with kinetic energies in the range 2-11 keV, i.e., in the velocity interval of 0.3-0.65 a.u. We find a cross section which is proportional to the projectile velocity, which is quite unlike the behavior of corresponding atomic cross sections, and which has never previously been observed experimentally.

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“…Single ionization cross sections for the Li atom by antiproton-impact are shown in FIGURE 1(c), with good agreement between the represent TDCC-1e and previous time-dependent basis-set calculations for the entire range of incident energy. [11]; solid (green) circles with error bars: experiment [12], (b) Antiproton-impact single ionization of He. Striped (red) squares: TDCC-1e calculations; solid (red) squares: TDCC-2e calculations [13]; dashed (blue) curve: Time-Dependent Finite Element calculations [14]; solid (green) circles with error bars: experiment [15]; striped (green) circles with error bars: experiment [16], (c) Antiproton-impact single ionization of Li.…”

Section: Ionization Cross Sectionsmentioning

confidence: 99%

Time-dependent close-coupling study of antiproton-impact ionization of atoms and molecules

Lee¹,

Pindzola²,

Colgan³

2013

AIP Conference Proceedings

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Ionization of Atomic Hydrogen by 30–1000 keV Antiprotons

Cited by 81 publications

References 13 publications

Ionization and excitation in collisions between antiprotons and H(1s) atoms studied with Sturmian bases

Ionization and excitation in collisions between antiprotons and H(1s) atoms studied with Sturmian bases

Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions

Time-dependent close-coupling study of antiproton-impact ionization of atoms and molecules

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