Ionization of Hydrogen and Hydrogenic Ions by Antiprotons

Schultz, David; Krstić, Predrag; Reinhold, C. O.; Wells, Jack

doi:10.1103/physrevlett.76.2882

Cited by 78 publications

(62 citation statements)

References 26 publications

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“…1. This calculation is essentially a contem porary version o f that w hich we carried out in 1996 to elucidate the m echanism s leading to the behavior o f ionization o f atom s by antiproton im pact [15,16], for exam ple, the dynam ical exceeding o f the Ferm i-Teller lim it at low energies, and w hich was confirm ed by other authors (see, e.g., Ref. [17]).…”

Section: Angular Momentum Transfer In Ion-atom Collisionssupporting

confidence: 59%

Hydrodynamical interpretation of angular momentum and energy transfer in atomic processes

2014

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Through the description of several simple atomic-scale systems for illustration, the hydrodynamical interpretation of results of solving the time-dependent Schrodinger equation is used to elucidate the fundamental processes of angular momentum and energy transfer. Connections are made between the hydrodynamical interpretation and conventional views such as interference of superpositions of states. Along with previous theoretical and experimental demonstration of the existence of the hydrodynamical signatures born in atomic-scale interactions and remaining in the asymptotic observables, these illustrations show the complementarity of the hydrodynamical and conventional pictures as well as additional insight provided by the former.

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Section: Angular Momentum Transfer In Ion-atom Collisionssupporting

confidence: 59%

Hydrodynamical interpretation of angular momentum and energy transfer in atomic processes

2014

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“…Since is small, the ionization cross section turns out to take large values even near the threshold (E I + ); such a feature was reported in a QM study forp + H [33]. The obvious alteration in the behavior of the capture cross section just above the ionization threshold was reported also in the FMD and classical trajectory Monte Carlo (CTMC) calculations for the captures by H and He targets [13,32,34,35]. For heavier targets including Li atoms, however, the FMD calculation shows rather a smooth behavior around the first ionization threshold [13,32]: At the energy E = 8.16 eV (0.3 a.u.)…”

Section: B Total Cross Sectionmentioning

confidence: 67%

“…and has the local maximum at R TP 1.1 a.u., which is slightly smaller than R 0 in Eq. (35). Cohen carried out the FMD calculation of the total capture cross sections inp + Li [13].…”

Section: B Total Cross Sectionmentioning

confidence: 99%

Long-lived states of antiprotonic lithiump¯Li+produced inp¯
Sakimoto
¹

2011
Phys. Rev. A
6
1
18
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Antiproton capture by lithium atoms (p + Li →pLi + + e) is investigated at collision energies from 0.01 to 10 eV by using a semiclassical (also know as quantum-classical hybrid) method, in which the radial distance between the antiproton and the Li + ion is treated as a classical variable, and the other degrees of freedom are described by quantum mechanics. Analyzing the wave packet of the emitted electrons and making use of the energy conservation rule enable us to calculate the state distribution of the produced antiprotonic lithiumpLi + atoms and also to distinguish between the capture and ionization (→p + Li + + e) channels at collisional energies above the ionization threshold. This method is tested for the capture of negative muons by hydrogen atoms, which was rigorously investigated in previous quantum mechanical studies. Most of thepLi + atoms produced inp + Li are found to be sufficiently stable against Auger decays and are experimentally observable as long-lived states. The present system bears close similarities to the system ofp + He(2S). It is therefore expected that long-lived antiprotonic heliumpHe + atoms can be efficiently produced in thep capture by metastable He(2 3 S) atoms.

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“…Schultz et al [19] have noted that for internuclear separations larger than the Fermi-Teller radius R FT = 0.64a o [20], the pp dipole is sufficient to support bound molecular electronic states, but as the internuclear separation is reduced, these states correlate to states at the ionization threshold; there are no bound molecular states for smaller internuclear distances. The Fermi-Teller area πR 2 FT = 3.6 × 10 −17 cm 2 is thus a lower bound to the low energyp-H ionization cross section.…”

Section: Shown Inmentioning

confidence: 99%

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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Ionization of Hydrogen and Hydrogenic Ions by Antiprotons

Abstract: Presented here is a description of the ionization of hydrogen and hydrogenic

Cited by 78 publications

References 26 publications

Hydrodynamical interpretation of angular momentum and energy transfer in atomic processes

Hydrodynamical interpretation of angular momentum and energy transfer in atomic processes

Long-lived states of antiprotonic lithiump¯Li+produced inp¯
Sakimoto
¹

2011
Phys. Rev. A
6
1
18
0
View full text Add to dashboard Cite

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

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Ionization of Hydrogen and Hydrogenic Ions by Antiprotons

Abstract: Presented here is a description of the ionization of hydrogen and hydrogenic

Cited by 78 publications

References 26 publications

Hydrodynamical interpretation of angular momentum and energy transfer in atomic processes

Hydrodynamical interpretation of angular momentum and energy transfer in atomic processes

Long-lived states of antiprotonic lithiump¯Li+produced inp¯Sakimoto1 2011Phys. Rev. A61180View full textAdd to dashboardCite

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

Contact Info

Product

Resources

About

Long-lived states of antiprotonic lithiump¯Li+produced inp¯
Sakimoto
¹

2011
Phys. Rev. A
6
1
18
0
View full text Add to dashboard Cite