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MO: Fachverband Molekülphysik

MO 28: Ultrafast Dynamics IV

MO 28.4: Vortrag

Freitag, 14. März 2025, 11:45–12:00, HS XVI

Asymmetry parameter of the iodoalkanes — •Maximilian Forster¹, Maximilian Pollanka¹, Sven-Joachim Paul¹, Pascal Freisinger¹, Christian Schröder¹, Michele Alagia², Alessio Bruno³, Robert Richter², Stefano Stranges³, and Reinhard Kienberger¹ — ¹Technische Universtiät München — ²Elettra Synchrotron Triest — ³Sapienza University of Rome

We measured the asymmetry parameter of photoemission from the Iodine 4d state in four different Iodoalkanes across an energy range of 60 to 160 eV.

We previously conducted photoemission delay measurements of the Iodoalkanes in our group using attosecond streaking. There we see a dependence on the species, the molecular surrounding of the iodine atom influences its photoemission delay. Since photoemission delay is interpreted as scattering delay, intramolecular scattering of the outgoing photoelectron is a logical explanation. It has been shown experimentally that the molecular environment can affect the asymmetry parameter, most likely also through intramolecular scattering. By measuring the asymmetry parameter we can compare the behavior to our previous measurements and clearly identify intramolecular scattering as the underlying cause for the behavior both in the time and the spectral domain. While we saw an effect, it is not the same as in our measurements, therefore the picture is not as intuitive as we had hoped.

The measurements were conducted at the Elettra synchrotron using the gas phase endstation.

Keywords: Iodine; Attosecond streaking; Asymmetry parameter; Photoemission spectroscopy