Circular Dichroism in Multiphoton Ionization of Resonantly Excited Helium Ions near Channel Closing
| Autor: | Wagner, Rene, Ilchen, Markus, Douguet, Nicolas, Schmidt, Philipp, Wieland, Niclas, Callegari, Carlo, Delk, Zachary, Demidovich, Alexander, Di Fraia, Michele, Hofbrucker, Jiri, Manfredda, Michele, Music, Valerija, Plekan, Oksana, Prince, Kevin C., Rivas, Daniel E., Zangrando, Marco, Grum-Grzhimailo, Alexei N., Bartschat, Klaus, Meyer, Michael |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The circular dichroism (CD) of photoelectrons generated by near-infrared (NIR) laser pulses using multiphoton ionization of excited He$^+$ ions in the 3p(m=+1) state. The ions were prepared by circularly polarized extreme ultraviolet (XUV) pulses. For circularly polarized NIR pulses co- and counter-rotating relative to the polarization of the XUV pulse, a complex variation of the CD is observed as a result of intensity- and polarization-dependent Freeman resonances, with and without additional dichroic AC-Stark shifts. The experimental results are compared with numerical solutions of the time-dependent Schr\"odinger equation to identify and interpret the pronounced variation of the experimentally observed CD. Comment: 9 pages, 8 figures |
| Databáze: | arXiv |
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