Multiple photon excitation of adsorbed toluene by KrF laserстатья
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Дата последнего поиска статьи во внешних источниках: 16 февраля 2016 г.
Аннотация:KrF laser-induced multiple photon dissociation and desorption of toluene condensed on
fused silica have been studied using mass spectrometry. The three-photon (2-1) excitation of
the molecule including its transition connected with laser stimulated emission was found to
control this dissociation in all coverages as well as the ejection of single toluene molecules
from the multilayer. Fragments were also produced in two successive steps of two-photon
excitation that caused the release of toluene clusters from the adsorbed multilayer and the
breaking of intramolecular bonds in the desorbed species. A mechanism of toluene and its
cluster ejection has been proposed. The difference in the dynamics of the excited adsorbed and
gaseous molecules has been discovered. The irradiation of the silica surface by KrF laser was
found to lead to an increase of the local laser field acting on the adsorbed toluene of more than
50 times.