Anisotropic photoemission time delays close to a Fano resonance.

Anisotropic photoemission time delays close to a Fano resonance.
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DOI:
10.1038/s41467-018-03009-1
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发表时间:
2018-03-06
影响因子:
16.6
通讯作者:
Keller U
Keller U
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Cirelli C;Marante C;Heuser S;Petersson CLM;Galán ÁJ;Argenti L;Zhong S;Busto D;Isinger M;Nandi S;Maclot S;Rading L;Johnsson P;Gisselbrecht M;Lucchini M;Gallmann L;Dahlström JM;Lindroth E;L'Huillier A;Martín F;Keller U

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Electron correlation and multielectron effects are fundamental interactions that govern many physical and chemical processes in atomic, molecular and solid state systems. The process of autoionization, induced by resonant excitation of electrons into discrete states present in the spectral continuum of atomic and molecular targets, is mediated by electron correlation. Here we investigate the attosecond photoemission dynamics in argon in the 20–40 eV spectral range, in the vicinity of the 3s−1np autoionizing resonances. We present measurements of the differential photoionization cross section and extract energy and angle-dependent atomic time delays with an attosecond interferometric method. With the support of a theoretical model, we are able to attribute a large part of the measured time delay anisotropy to the presence of autoionizing resonances, which not only distort the phase of the emitted photoelectron wave packet but also introduce an angular dependence. Ionization time delays are of interest in understanding the photoionization mechanism in atoms and molecules in ultra-short time scales. Here the authors investigate the angular dependence of photoionization time delays in the presence of an autoionizing resonance in argon atom using RABBITT technique.
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