Del Mar Photonics sponsors APS focus session "Photophysics of Cold Molecules"
Isolation of Molecules in Helium Nanodroplets: Spectroscopy and Dynamics at
Ultra-cold Temperatures
8:00 AM–8:36 AM
Preview Abstract
Author:
Frank Stienkemeier
(University of Freiburg)
The isolation of atoms, molecules, clusters or nano-sized complexes in helium
nanodroplets allows detailed spectroscopic studies at temperatures in the
millikelvin range. Moreover, femtosecond real-time spectroscopy has been
introduced to study dynamical processes in the ultracold helium environment. On
the one hand, wave packet propagation opens a window to dynamical processes,
allowing even a view to superfluid properties at the nanoscale. This is
exemplified at decoherence effects in the wave packet propargation of small
molecules attached to the droplets. On the other hand, high-resolution mass
spectra using both femtosecond photoionisation (PI) as well as electron impact
ionization enable us to characterize reactive processes at temperatures in the
millikelvin range. As an example, alkali cluster -- water complexes are formed
in helium droplets. By recording multi-photon PI spectra we can distinguish
between reactive processes of the neutral clusters and ionic reactions occurring
after ionisation of the alkali cluster component. These studies pave the way to
time-resolved reaction dynamics at very low temperatures.
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