Exploring photoelectron angular distributions emitted from molecular dimers by two delayed intense laser pulses Article Swipe
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· 2020
· Open Access
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· DOI: https://doi.org/10.1103/physreva.102.053115
· OA: W3047277142
We describe the results of experiments and simulations performed with the aim\nof extending photoelectron spectroscopy with intense laser pulses to the case\nof molecular compounds. Dimer frame photoelectron angular distributions\ngenerated by double ionization of N$_2$-N$_2$ and N$_2$-O$_2$ van der Waals\ndimers with ultrashort, intense laser pulses are measured using four-body\ncoincidence imaging with a reaction microscope. To study the influence of the\nfirst-generated molecular ion on the ionization behavior of the remaining\nneutral molecule we employ a two-pulse sequence comprising of a linearly\npolarized and a delayed elliptically polarized laser pulse that allows\ndistinguishing the two ionization steps. By analysis of the obtained electron\nmomentum distributions we show that scattering of the photoelectron on the\nneighbouring molecular potential leads to a deformation and rotation of the\nphotoelectron angular distribution as compared to that measured for an isolated\nmolecule. Based on this result we demonstrate that the electron momentum space\nin the dimer case can be separated, allowing to extract information about the\nionization pathway from the photoelectron angular distributions. Our work, when\nimplemented with variable pulse delay, opens up the possibility of\ninvestigating light-induced electronic dynamics in molecular dimers using\nangularly resolved photoelectron spectroscopy with intense laser pulses.\n
