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AMO Seminar: Robert Zillich 'Spectroscopy in Helium Nanodroplets'

22.02.2013 | Grete Flarup

Dato tor 11 apr
Tid 15:15 16:00
Sted Fys. Aud.

Matrix spectroscopy has the advantage that the atoms or molecules being probed can be isolated and cooled, but the matrix holding the "sample"

usually has a significant effect on the spectra.  These effects can be minimized by using superfluid helium-4 as matrix.  Therefore, spectroscopy of helium-4 nanodroplets doped with single atoms or molecules or clusters of them has become a versatile experimental tool.

Interpretation of spectra obtained in this quantum matrix require knowledge about the influence of helium on the dynamics of the probed atom or molecule.  In my presentation, I will give an overview of calculation methods for this non-trivial quantum many-body system, based on Monte Carlo simulations, but also on traditional many-body techniques.  I present some results on rotational spectra of neutral and ionic molecules inside and on the surface of helium clusters, and on the formation of alkali-helium exciplexes, and discuss the influence of superfluidity of helium on molecule rotation spectra.  Experiments of large organic molecules and of metal clusters in helium-4 have gotten much less attention from the theoretical physics and chemistry community since accurate interactions potential are not known in this case.  We are tackling this problem with a phenomenological approach to obtain the all-important interactions between the dopant and the He atoms.

Coffee/tea and cake will be served from 15:05

Institut for Fysik og Astronomi, Medarbejdere, Offentligheden / Pressen
Henvendelse om denne sides indhold: 
Revideret 29.08.2014

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Institut for Fysik og Astronomi
Aarhus Universitet
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8000 Aarhus C

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CVR-nr: 31119103

Momsnummer/VAT: DK 3111 9103
(alle internationale køb)

P-nr: 1009828059

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Enhedsnummer: 5200

Aarhus Universitet
Nordre Ringgade 1
8000 Aarhus C

E-mail: au@au.dk
Tlf: 8715 0000
Fax: 8715 0201

CVR-nr: 31119103
EAN-numre: www.au.dk/eannumre

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