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1994Metadata
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Aufsatz
Femtosecond dynamics of molecules and clusters
Abstract
The real-time dynamics of multiphoton ionization and fragmentation of molecules - Na_2 , Na_3 - and clusters - Na_n, Hg_n - has been studied in molecular beam experiments employing ion and electron spectroscopy together with femtosecond pump-probe techniques. Experiments with Na_2 and Na_3 reveal unexpected features of the dynamics of the absorption of several photons as seen in the one- and three dimensional vibrational wave packet motion in different potential surfaces and in high laser fields. Cluster size dependent studies of physical properties such as absorption resonances, lifetimes and decay channels have been performed using tunable femtosecond light pulses in resonance enhanced multiphoton ionization (REMPI) of the cluster size under investigation.
This method failed in ns-laser experiments due to the ultrafast decay of the studied cluster. For Na_n, cluster we find that for cluster sizes n \le 21 molecular excitations and properties prevail over collective excitations of plasmon-like resonances. In the case of Hg_n cluster prompt formation of singly and doubly charged cluster are observed up to n \approx 60. The transient multiphoton ionization spectra show a 'short' time wave packet dynamics, which is identical for singly and doubly charged mercury clusters while the 'long' time fragmentation dynamics is different.
This method failed in ns-laser experiments due to the ultrafast decay of the studied cluster. For Na_n, cluster we find that for cluster sizes n \le 21 molecular excitations and properties prevail over collective excitations of plasmon-like resonances. In the case of Hg_n cluster prompt formation of singly and doubly charged cluster are observed up to n \approx 60. The transient multiphoton ionization spectra show a 'short' time wave packet dynamics, which is identical for singly and doubly charged mercury clusters while the 'long' time fragmentation dynamics is different.
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Publikationen (Experimentalphysik III - Femtosekundenspektroskopie und ultraschnelle Laserkontrolle)Citation
@article{urn:nbn:de:hebis:34-2008102924902,
author={Baumert, Thomas and Thalweiser, Rainer and Weiss, V. and Wiedenmann, Ernst and Gerber, Gustav},
title={Femtosecond dynamics of molecules and clusters},
year={1994}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 1994$n1994 1500 1/eng 2050 ##0##urn:nbn:de:hebis:34-2008102924902 3000 Baumert, Thomas 3010 Thalweiser, Rainer 3010 Weiss, V. 3010 Wiedenmann, Ernst 3010 Gerber, Gustav 4000 Femtosecond dynamics of molecules and clusters / Baumert, Thomas 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/urn:nbn:de:hebis:34-2008102924902=x R 4204 \$dAufsatz 4170 7136 ##0##urn:nbn:de:hebis:34-2008102924902
<resource xsi:schemaLocation="http://datacite.org/schema/kernel-2.2 http://schema.datacite.org/meta/kernel-2.2/metadata.xsd"> 2008-10-29T08:05:18Z 2008-10-29T08:05:18Z 1994 0-444-85776-1 urn:nbn:de:hebis:34-2008102924902 http://hdl.handle.net/123456789/2008102924902 976986 bytes application/pdf eng Ed. by Douwe A. Wiersma Urheberrechtlich geschützt https://rightsstatements.org/page/InC/1.0/ 530 Femtosecond dynamics of molecules and clusters Aufsatz The real-time dynamics of multiphoton ionization and fragmentation of molecules - Na_2 , Na_3 - and clusters - Na_n, Hg_n - has been studied in molecular beam experiments employing ion and electron spectroscopy together with femtosecond pump-probe techniques. Experiments with Na_2 and Na_3 reveal unexpected features of the dynamics of the absorption of several photons as seen in the one- and three dimensional vibrational wave packet motion in different potential surfaces and in high laser fields. Cluster size dependent studies of physical properties such as absorption resonances, lifetimes and decay channels have been performed using tunable femtosecond light pulses in resonance enhanced multiphoton ionization (REMPI) of the cluster size under investigation. This method failed in ns-laser experiments due to the ultrafast decay of the studied cluster. For Na_n, cluster we find that for cluster sizes n \le 21 molecular excitations and properties prevail over collective excitations of plasmon-like resonances. In the case of Hg_n cluster prompt formation of singly and doubly charged cluster are observed up to n \approx 60. The transient multiphoton ionization spectra show a 'short' time wave packet dynamics, which is identical for singly and doubly charged mercury clusters while the 'long' time fragmentation dynamics is different. open access In: Femtosecond reaction dynamics : proceedings of the Colloquium "Femtosecond Reaction Dynamics", Amsterdam, 17 - 19 may 1993. Amsterdam u.a. : North-Holland, 1994, S. 29-47 Baumert, Thomas Thalweiser, Rainer Weiss, V. Wiedenmann, Ernst Gerber, Gustav Extern </resource>
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