Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 18: Helium Droplets and Systems (with MO)
A 18.3: Talk
Tuesday, March 7, 2017, 15:15–15:30, N 6
Fingerprints of the angulon quasiparticle in spectra of molecules in superfluid helium droplets — •Igor Cherepanov and Mikhail Lemeshko — Institute of Science and Technology Austria (IST Austria), Am Campus 1, 3400 Klosterneuburg, Austria
The recently developed angulon theory [1] represents a powerful tool to study interactions between a rotating molecular impurity and a macroscopically large number of helium atoms in a superfluid helium nanodroplet. The comparison of the experimental data on the renormalization of rotational constants for a wide range of different molecules and the predictions of the angulon theory [2] provides a strong evidence for angulon formation in superfluid 4He.
Here we demonstrate that angulon theory is also able to explain some features observed in the ro-vibrational spectra of the ν3 band of the methyl radical [3] and the ammonia molecule [4] solvated in superfluid 4He. We found that one of the largest anisotropic terms in the CH3(NH3)-He potential expansion induces a transfer of one quantum of angular momentum from the molecule to the many-body bath. As a consequence, the spectral line corresponding to the R R1 (1) transition becomes significantly broadened and suppressed compared to the gas phase. This amounts to an experimental confirmation of the angulon instabilities, recently predicted in Ref. [1].
[1] R. Schmidt, M. Lemeshko, Phys. Rev. Lett. 114, 203001 (2015)
[2] M. Lemeshko, arXiv:1610.04908 (2016)
[3] A. Morrison et al., J. Phys. Chem. A 117, 11640 (2013)
[4] M. Slipchenko, A. Vilesov, Chem. Phys. Lett. 412, 176 (2005)