Freiburg 2024 – scientific programme

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SYMC: Symposium Size Selected Metal Cluster Spectroscopies

SYMC 1: Size Selected Metal Cluster Spectroscopies

SYMC 1.4: Invited Talk

Thursday, March 14, 2024, 12:30–13:00, Paulussaal

IR action spectroscopy of metal clusters, complexes and diatomics with free electron lasers — •André Fielicke — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany

Structural studies of gas-phase species that are only meta-stable can possess a number of experimental challenges: the gas-phase densities achievable are usually extremely low and often they are present in complex mixtures, e.g., broad distributions of cluster sizes and/or compositions. An approach to these difficulties offers infrared (IR) action spectroscopy that relies on mass spectrometric means to detect photo absorption processes. In my talk I will briefly discuss recent insights into the structures of neutral gold clusters obtained from far-IR spectroscopy in combination with DFT and coupled-cluster theory.[1] In this case, multiple photon dissociation of krypton complexes is used to monitor the cluster-size specific IR absorption. Furthermore, we have applied vibrational autoionization of Rydberg states for IR spectroscopy of cationic species, using weakly interacting non core-penetrating Rydberg electrons as messenger. This will be illustrated for DyO⁺ for which rotationally resolved vibrational spectra have been obtained.

[1] Chem. Commun. 2022, 58, 5785; Phys. Chem. Chem. Phys. 2023, 25, 9036.

Keywords: metal clusters; diatomics; free electron laser; infrared spectroscopy