Dichroic Electron Emission Patterns from Oriented Helium Ions
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arXiv
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2025
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| author | Wieland, Niclas Bartschat, Klaus Dudda, Filippa Wagner, René Schmidt, Philipp Callegari, Carlo Demidovich, Alexander De Ninno, Giovanni Di Fraia, Michele Hofbrucker, Jiri Manfredda, Michele Music, Valerija Plekan, Oksana Prince, Kevin C. Rivas, Daniel E. Zangrando, Marco Douguet, Nicolas Grum-Grzhimailo, Alexei N. Meyer, Michael Ilchen, Markus |
| author_facet | Wieland, Niclas Bartschat, Klaus Dudda, Filippa Wagner, René Schmidt, Philipp Callegari, Carlo Demidovich, Alexander De Ninno, Giovanni Di Fraia, Michele Hofbrucker, Jiri Manfredda, Michele Music, Valerija Plekan, Oksana Prince, Kevin C. Rivas, Daniel E. Zangrando, Marco Douguet, Nicolas Grum-Grzhimailo, Alexei N. Meyer, Michael Ilchen, Markus |
| contents | We report a joint experimental and theoretical study using a combination of polarization-controlled free-electron-laser (FEL) and near-infra\-red (NIR) pulses in a synchronized two-color photo\-ionization scheme. Excited He$^+$ ions, created by extreme ultraviolet (XUV) circularly polarized radiation from the XUV-FEL FERMI in the oriented $3p\, (m\!=\!+1)$ state, are exposed to circularly polarized 784-nm NIR radiation with peak intensities from $10^{12}\,\rm W/cm^2$ to $\rm 10^{13}\,W/cm^2$. The angular distribution of the ejected electrons exhibit a strong dichroism depending on the NIR intensity. While the co-rotating case is defined by a single path, for the counter-rotating case, there are two dominant pathways whose relative strength and phase difference are determined. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_17919 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dichroic Electron Emission Patterns from Oriented Helium Ions Wieland, Niclas Bartschat, Klaus Dudda, Filippa Wagner, René Schmidt, Philipp Callegari, Carlo Demidovich, Alexander De Ninno, Giovanni Di Fraia, Michele Hofbrucker, Jiri Manfredda, Michele Music, Valerija Plekan, Oksana Prince, Kevin C. Rivas, Daniel E. Zangrando, Marco Douguet, Nicolas Grum-Grzhimailo, Alexei N. Meyer, Michael Ilchen, Markus Atomic Physics We report a joint experimental and theoretical study using a combination of polarization-controlled free-electron-laser (FEL) and near-infra\-red (NIR) pulses in a synchronized two-color photo\-ionization scheme. Excited He$^+$ ions, created by extreme ultraviolet (XUV) circularly polarized radiation from the XUV-FEL FERMI in the oriented $3p\, (m\!=\!+1)$ state, are exposed to circularly polarized 784-nm NIR radiation with peak intensities from $10^{12}\,\rm W/cm^2$ to $\rm 10^{13}\,W/cm^2$. The angular distribution of the ejected electrons exhibit a strong dichroism depending on the NIR intensity. While the co-rotating case is defined by a single path, for the counter-rotating case, there are two dominant pathways whose relative strength and phase difference are determined. |
| title | Dichroic Electron Emission Patterns from Oriented Helium Ions |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2507.17919 |