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 $3$~keV up to $1000$~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

My farewell don\u27t mean good bye

https://digitalcommons.library.umaine.edu/mmb-vp/2176/thumbnail.jp

Let Me In, Dat\u27s All

https://digitalcommons.library.umaine.edu/mmb-vp/4268/thumbnail.jp

How\u27d You Like To Like A Girl Like Me?

https://digitalcommons.library.umaine.edu/mmb-vp/5164/thumbnail.jp

When The Winter Days Are Over

https://digitalcommons.library.umaine.edu/mmb-vp/6006/thumbnail.jp

The Man Who Fights The Fire

https://digitalcommons.library.umaine.edu/mmb-vp/4890/thumbnail.jp

My Cavalier: Dreaming Idly Dreaming

https://digitalcommons.library.umaine.edu/mmb-vp/2167/thumbnail.jp

Senora : Spanish Waltz

https://digitalcommons.library.umaine.edu/mmb-ps/2131/thumbnail.jp