Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/192737
Title: | Alkali atoms attached to vortex-hosting helium nanodroplets |
Author: | García-Alfonso, Ernesto Coppens, Francois Barranco Gómez, Manuel Pi Pericay, Martí Stienkemeier, Frank Halberstadt, Nadine |
Keywords: | Heli Teoria del funcional de densitat Helium Density functionals |
Issue Date: | 20-May-2020 |
Publisher: | American Institute of Physics (AIP) |
Abstract: | Light absorption or fluorescence excitation spectroscopy of alkali atoms attached to 4He droplets is investigated as a possible way for detecting the presence of vortices. To this end, we have calculated the equilibrium configuration and energetics of alkali atoms attached to a 4He1000 droplet hosting a vortex line using 4He density functional theory. We use them to study how the dipole absorption spectrum of the alkali atom is modified when the impurity is attached to a vortex line. Spectra are found to be blue-shifted (higher frequencies) and broadened compared to vortex-free droplets because the dimple in which the alkali atom sits at the intersection of the vortex line and the droplet surface is deeper. This effect is smaller for lighter alkali atoms and all the more so when using a quantum description since, in this case, they sit further away from the droplet surface on average due to their zero-point motion. Spectral modifications due to the presence of a vortex line are minor for np ← ns excitation and therefore insufficient for vortex detection. In the case of higher n′p ← ns or n′s ← ns (n′ > n) excitations, the shifts are larger as the excited state orbital is more extended and therefore more sensitive to changes in the surrounding helium density. |
Note: | Reproducció del document publicat a: https://doi.org/10.1063/5.0008923 |
It is part of: | Journal of Chemical Physics, 2020, vol. 152, num. 19, p. 1-9 |
URI: | http://hdl.handle.net/2445/192737 |
Related resource: | https://doi.org/10.1063/5.0008923 |
ISSN: | 0021-9606 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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701400.pdf | 5.01 MB | Adobe PDF | View/Open |
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