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MO: Fachverband Molekülphysik
MO 20: Control (joint session MO/Q)
MO 20.5: Vortrag
Freitag, 13. März 2020, 15:00–15:15, f102
Rotational spectroscopy of molecular superrotors: probing high rotational states of O2 via REMPI technique combined with an optical centrifuge. — •Audrey Scognamiglio1, Jordan Fordyce2, Ian MacPhail-Bartley2, Katrin Dulitz1, Frank Stienkemeier1, and Valery Milner2 — 1Institut of Physics, University of Freiburg, Germany — 2Department of Physics and Astronomy, University of British Columbia, Canada
To access highly excited rotational states (e.g. N=100 in O2), the use of an optical centrifuge has been demonstrated to be a powerful and unique experimental tool.
To start from a well-defined initial ro-vibrational state, oxygen molecules are cooled to 10K by means of supersonic expansion. Due to the relatively low density, spectroscopic techniques combining high frequency resolution and high sensitivity are required. For this purpose, resonance enhanced multiphoton ionization of oxygen is employed in a "2+1" scheme with a two-photons transition from the ground state X3 Σg− (ν =0) to the excited state C3 Πg (ν =2) from which another photon ionizes the molecule.
In this contribution, experimental results of REMPI spectroscopy of oxygen superrotors, as well as their numerical analysis, will be presented.