TY  - JOUR
AU  - Wagner, Rene
AU  - Ilchen, Markus
AU  - Douguet, Nicolas
AU  - Schmidt, Philipp
AU  - Wieland, Niclas
AU  - Callegari, Carlo
AU  - Delk, Zachary
AU  - Demidovich, Alexander
AU  - Ninno, Giovanni De
AU  - Fraia, Michele Di
AU  - Hofbrucker, Jiri
AU  - Manfredda, Michele
AU  - Music, Valerija
AU  - Plekan, Oksana
AU  - Prince, Kevin
AU  - Rivas, Daniel
AU  - Zangrando, Marco
AU  - Grum-Grzhimailo, Alexei
AU  - Bartschat, Klaus
AU  - Meyer, Michael
TI  - Circular dichroism in multiphoton ionization of resonantly excited helium ions near channel closing
JO  - Scientific reports
VL  - 14
IS  - 1
SN  - 2045-2322
CY  - London
PB  - Macmillan Publishers Limited, part of Springer Nature
M1  - PUBDB-2024-06309
SP  - 27232
PY  - 2024
N1  - Prof. Alexei N. Grum-Grzhimailo (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia) has been part of the overall project agenda of the paper by Wagner et al. since 2014 and the data in this publication has been acquired in 2019. Prof. Grum-Grzhimailo provided calculations for the underlying FERMI proposal in 2018 and has since then not been further involved in the project. Since his contribution has concluded before the war started, we ask for permission to publish the paper with Prof. Alexei N. Grum-Grzhimailo as Co-author under the given affiliation.
AB  - The circular dichroism (CD) of photoelectrons generated by near-infrared (NIR) laser pulses usingmultiphoton ionization of excited He+ ions in the 3p (m = +1) state is investigated. The ions wereprepared by circularly polarized extreme ultraviolet (XUV) pulses. For circularly polarized NIR pulsesco- and counter-rotating relative to the polarization of the XUV pulse, a complex variation of the CD isobserved as a result of intensity- and polarization-dependent Freeman resonances, with and withoutadditional dichroic AC-Stark shifts. The experimental results are compared with numerical solutionsof the time-dependent Schrödinger equation to identify and interpret the pronounced variation of theexperimentally observed CD.
LB  - PUB:(DE-HGF)16
C6  - 39516212
UR  - <Go to ISI:>//WOS:001378238200008
DO  - DOI:10.1038/s41598-024-75459-1
UR  - https://bib-pubdb1.desy.de/record/616014
ER  -