SAMOP 2023 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Rotational- and Vibrational-resolution Spectroscopy
MO 15.3: Vortrag
Donnerstag, 9. März 2023, 11:45–12:00, F142
Leak-out spectroscopy: a new, universal action spectroscopy method — •Philipp C. Schmid, Thomas Salomon, Sven Thorwirth, Oskar Asvany, and Stephan Schlemmer — I. Physikalisches Institut, Universität zu Köln, Köln, Germany
Rotational-resolved vibrational spectra of molecular ions are recorded using action spectroscopy techniques in cryogenic ion traps [1]. Thereby the spectrum is identified as a change of the ion mass by fragmentation upon photon absorption, pre-dissociation of tagged ions or via laser induced chemical reactions. Although all these techniques have advanced significantly, action spectroscopy cannot be applied to many ions when the aforementioned methods fail to work.
Here, we present a new method of action spectroscopy, called leak-out spectroscopy (LOS) [2]. LOS does not rely on a change in the mass of the ion, but on the transfer of internal energy of an excited ion to its translation energy upon the collision with a neutral partner. This allows the fast ions to escape the trap potentials and thus the spectrum can be recorded by detecting the ions leaving the trap. Based on this principle, LOS is intrinsically background free and suitable for virtually any ion. In recent measurements we used LOS to record the ro-vibrational resolved ν1 C-H stretching vibration spectrum of l-C3H+.
[1] B.A. McGuire et al., Nature Review Physics 2(2020)402.
[2] P.C. Schmid et al., J. Phys. Chem. A 126(2022)8111.