Spectroscopy of gold atoms and gold oligomers in helium nanodroplets

The Journal of Chemical Physics
Roman MessnerWolfgang E Ernst

Abstract

The 6p 2P1/2 ← 6s 2S1/2 and 6p 2P3/2 ← 6s 2S1/2 transitions (D lines) of gold atoms embedded in superfluid helium nanodroplets have been investigated using resonant two-photon ionization spectroscopy. Both transitions are strongly blue-shifted and broadened due to the repulsive interaction between the Au valence electron and the surrounding helium. The in-droplet D lines are superimposed by the spectral signature of Au atoms relaxed into the metastable 2D states. These features are narrower than the in-droplet D lines and exhibit sharp rising edges that coincide with bare atom transitions. It is concluded that they originate from metastable 2D state AuHen exciplexes that have been ejected from the helium droplets during a relaxation process. Interestingly, the mechanism that leads to the formation of these complexes is suppressed for very large helium droplets consisting of about 2 × 106 He atoms, corresponding to a droplet diameter on the order of 50 nm. The assignment of the observed spectral features is supported by ab initio calculations employing a multiconfigurational self-consistent field method and a multi-reference configuration interaction calculation. For large helium droplets doped with Au oligomers, excitation spec...Continue Reading

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Citations

Nov 9, 2019·Physical Chemistry Chemical Physics : PCCP·Lorenz KranabetterPaul Scheier
Oct 16, 2020·Physical Chemistry Chemical Physics : PCCP·Wolfgang E Ernst, Andreas W Hauser
Jun 7, 2019·Journal of the American Society for Mass Spectrometry·Linnea LundbergPaul Scheier
Jun 27, 2019·The Journal of Physical Chemistry. a·Lev KazakJosef Tiggesbäumker
Apr 12, 2019·The Journal of Physical Chemistry. a·Bernhard ThalerWolfgang E Ernst
Dec 15, 2020·The Journal of Physical Chemistry Letters·Roman MessnerFlorian Lackner

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