Attosecond Delays in Molecular Photoionization.
Phys Rev Lett
; 117(9): 093001, 2016 Aug 26.
Article
en En
| MEDLINE
| ID: mdl-27610849
We report measurements of energy-dependent photoionization delays between the two outermost valence shells of N_{2}O and H_{2}O. The combination of single-shot signal referencing with the use of different metal foils to filter the attosecond pulse train enables us to extract delays from congested spectra. Remarkably large delays up to 160 as are observed in N_{2}O, whereas the delays in H_{2}O are all smaller than 50 as in the photon-energy range of 20-40 eV. These results are interpreted by developing a theory of molecular photoionization delays. The long delays measured in N_{2}O are shown to reflect the population of molecular shape resonances that trap the photoelectron for a duration of up to â¼110 as. The unstructured continua of H_{2}O result in much smaller delays at the same photon energies. Our experimental and theoretical methods make the study of molecular attosecond photoionization dynamics accessible.
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01-internacional
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2016
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Article
País de afiliación:
Suiza
Pais de publicación:
Estados Unidos