Ionization in collisions between metastable hydrogen atoms

Bohr, Alex; Blickle, Andrew; Paolini, Stephen; Ohlinger, Luke; Forrey, Robert C.

doi:10.1103/physreva.85.042710

Cited by 8 publications

(5 citation statements)

References 54 publications

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“…In recent years, the excitation and ionization processes of metastable hydrogen in 2s state by positron impact and many other scattering processes by electron, proton, and anti-proton impact have attracted considerable interests and abundant phenomena were found. [7][8][9][10] The Ps formation process of the metastable hydrogen has not been extensively investigated so far.…”

Section: Introductionmentioning

confidence: 99%

Positronium formation for positron scattering from metastable hydrogen

Lin¹,

Wang²,

Jiao

2017

Chinese Phys. B

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Positronium (Ps) formation for positron impact on metastable hydrogen in 2s state has been studied by using the twochannel, two-center eikonal final state-continuum initial distorted wave (EFS-CDW) method. The differential, integrated, and total cross sections for Ps formation in different states have been calculated from each channel opening thresholds to high energy region. The results are compared with other theoretical calculations available in the literature. For Ps formation in s-state at intermediate and high energies, our results are in good agreement with the prediction of distorted wave theory. Those formed in p-states and the total Ps formation cross sections are reported for the first time. It is shown that the total Ps formation cross sections for positron scattering from H(2s) state are significantly larger at relatively low energies, while smaller at high energies, compared with those obtained from hydrogen in ground state.

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Section: Introductionmentioning

confidence: 99%

Positronium formation for positron scattering from metastable hydrogen

Lin¹,

Wang²,

Jiao

2017

Chinese Phys. B

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“…Exploring and improving the new calculation possibilities and simulation techniques, attracted extensive attention in the chemi-ionization and (n-n')-mixing processes in atom Rydberg atom collisions, which resulted in numerous papers dedicated to this problem in various research fields like astrophysics, plasma physics, chemistry (see for example Bohr et al (2012); Barklem (2007); Mihajlov et al (2007a); Ryabtsev et al (2005)). …”

Section: Introductionmentioning

confidence: 99%

Non-Elastic Processes in Atom Rydberg-Atom Collisions: Review of State of Art and Problems

et al. 2015

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In our previous research, it has been demonstrated that such inelastic processes in atom Rydbergatom collisions, as chemi-ionization and (n-n') mixing, should be considered together. Here we will review the present state of the art and the actual problems will be discussed. In this context, we will consider the influence of the (n-n')-mixing during a symmetric atom Rydberg-atom collision processes on the intensity of chemi-ionization process. It will be taken into account H(1s) + H*(n) collisional systems, where the principal quantum number n >> 1. It will be demonstrated that the inclusion of (nn') mixing in the calculation, influences significantly on the values of chemi-ionization rate coefficients, particularly in the lower part of the block of the Rydberg states. Different possible channels of the (n-n')-mixing influence on chemi-ionization rate coefficients will be demonstrated. The possibility of interpretation of the (n-n')-mixing influence will be considered on the basis of two existing methods for describing of the inelastic processes in symmetrical atom Rydberg-atom collisions.

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“…The doubly excited states of H 2 play important roles in the photon-impact on H 2 [1][2][3][4][5], electron-impact on H 2 [6,7], [9,10], + H H and + + − H H collisions [11][12][13]. The energies of the doubly excited states H 2 are embedded in the continuum (located above the σ + − + e H (1s ) 2 threshold), and these states are autoionizing (resonance) states, which may be characterized by the symmetry, resonance energy and width as functions of internuclear distance.…”

Section: Introductionmentioning

confidence: 99%