Ultrafast XUV spectroscopy to probe conical intersections and excited state dynamics

Sandhu, Arvinder

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https://hdl.handle.net/2142/104253 Copy

Description

Title

Ultrafast XUV spectroscopy to probe conical intersections and excited state dynamics

Author(s)

Sandhu, Arvinder

Issue Date

2019-06-19

Keyword(s)

High-harmonic generation and XUV spectroscopy

Abstract

\begin{wrapfigure}{l}{0pt} \includegraphics[scale=0.3]{Conical.eps} \end{wrapfigure} Femtosecond and attosecond XUV spectroscopy was used to study of electron dynamics stemming from many-body interactions, including the coupling between the electronic and nuclear degrees of freedom, electronic correlations, external light fields, or a combination thereof. \footnote{This work was supported by the U. S. Army Research Laboratory and the U. S. Army Research Office under grant number W911NF-14-1-0383 and the National Science Foundation (NSF) award number PHY-1505556.} Conical intersections are an important topic of investigation because they serve as nature’s energy funnels in many biochemical processes, e.g. vision, light harvesting, etc. We focused on nuclear motion mediated evolution of an electron hole near a conical intersection in a CO$_2$ ion. Using pump-probe photodissociation spectroscopy, we made quantitative measurements of electronic couplings and monitored the role of decoherence in such dynamics, thereby probing the fundamental mechanisms responsible for the charge and energy redistribution in molecules. In another study, time resolved XUV photoelectron spectroscopy was applied to identify the role of multi electron excitations in the ultrafast Rydberg state dissociation of highly excited states in O$_2$. The talk will also discuss new opportunities arising the application of attosecond soft-x-ray sources.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/104253

DOI

https://doi.org/10.15278/isms.2019.WK01

Copyright and License Information

Copyright 2019 Arvinder Sandhu

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