Rostock 2019 – scientific programme
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MO: Fachverband Molekülphysik
MO 4: Electronic Spectroscopy
MO 4.5: Talk
Monday, March 11, 2019, 11:45–12:00, S HS 002 Biologie
Λ-doubling and Zeeman effect of 2Π3/2 molecules in helium nanodroplets — •Wojciech Rzadkowski and Mikhail Lemeshko — Institute of Science and Technology Austria (IST Austria), Am Campus 1, 3400 Klosterneuburg, Austria
Fine-structure levels of 2Π3/2 electronic state of diatomic molecules in the absence of external fields split into so-called Λ-doublets. In the presence of a magnetic field they split further, forming separate Zeeman levels. Both effects get strongly enhanced when the molecule is immersed into superfluid helium nanodroplets. This behavior lacks microscopic explanation, with only limited phenomenological models available.
We use the angulon quasiparticle [1] to build a joint microscopic model explaining both anomalous Λ− and Zeeman splittings. Our approach does not use extensive numerical calculations. Instead, a physically intuitive picture of bath-induced couplings between fine-structure levels of the molecule is introduced. The theory can be verified against experimental data readily available for OH molecule [2].
[1] M. Lemeshko, Quasiparticle Approach to Molecules Interacting with Quantum Solvents, Phys. Rev. Lett. 118, 095301 (2017)
[2] P. Raston, T. Liang, G. Douberly, Anomalous Λ doubling in the Infrared Spectrum of the Hydroxyl Radical in Helium Nanodroplets, J. Phys. Chem. A 117 (2013)