1,663 research outputs found
Ionization of helium by slow antiproton impact: total and differential cross sections
We theoretically investigate the single and double ionization of the He atom
by antiproton impact for projectile energies ranging from ~keV up to
~keV. We obtain accurate total cross sections by directly solving the
fully correlated two-electron time-dependent Schr\"odinger equation and by
performing classical trajectory Monte-Carlo calculations. The obtained
quantum-mechanical results are in excellent agreement with the available
experimental data. Along with the total cross sections, we also present the
first fully \textit{ab initio} doubly differential data for single ionization
at 10 and 100~keV impact energies. In these differential cross sections we
identify the binary-encounter peak along with the anticusp minimum.
Furthermore, we also point out the importance of the post-collisional
electron-projectile interaction at low antiproton energies which significantly
suppresses electron emission in the forward direction
Attosecond two-photon interferometry for doubly excited states of helium
We show that the correlation dynamics in coherently excited doubly excited
resonances of helium can be followed in real time by two-photon interferometry.
This approach promises to map the evolution of the two-electron wave packet
onto experimentally easily accessible non-coincident single electron spectra.
We analyze the interferometric signal in terms of a semi-analytical model which
is validated by a numerical solution of the time-dependent two-electron
Schr\"odinger equation in its full dimensionality.Comment: 5 pages, 4 figure
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