Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session F31: Inspirations From Experiment (E)
11:15 AM–2:03 PM,
Tuesday, March 5, 2019
BCEC Room: 203
Sponsoring Unit: DCP
Chair: Cristina Puzzarini
Abstract: F31.00002 : Probing electronic processes in large molecules
11:51 AM–12:27 PM
In this talk I will first present a time-resolved study of photo-fragmentation of the nucleobase adenine, one of the key building blocks of DNA. Our most intriguing observation is that a stable dication of the parent molecule can be produced if (and only if) the probing NIR pulse is very briefly delayed from the XUV pulse. Our experimental and theoretical findings indicate that this short delay corresponds to the lifetime of the inner valence hole. The process also evidences the presence of a laser-assisted stabilization of the nucleobase.
In the second part of the talk I will show the results we have recently obtained for a very large polyatomic molecule, namely the C60 molecule. Here we have investigated delays in photoemission after exciting the Giant surface Plasmonic Resonance (GPR) around 20 eV. Clear signatures of the collective electron dynamics initiated by the XUV pulse can be extracted from the experimental data.
 F. Krausz and M. Ivanov, “Attosecond physics,” Rev. Mod. Phys. 81, 163 (2009)
 M. Nisoli et al, Chem Rev 117 10760 (2017)
 F. Calegari et al, Science 346, 336 (2014)
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