https://doi.org/10.1007/s100530170082
Analysis and control of ultrafast photodissociation processes in organometallic molecules
Institut für Experimentalphysik, Freie Universität Berlin,
Arnimallee 14, D-14195 Berlin, Germany
Corresponding author: a vajda@physik.fu-berlin.de
Received:
9
January
2001
Published online: 15 September 2001
In this paper we characterize the ultrafast fragmentation in electronically excited
Fe(CO)2(NO)2 and CpMn(CO)3 by means of femtosecond time-resolved spectroscopy
combined with mass spectrometry. From the transient two-color multi-photon
ionization data, it was possible to record the transients of the parent molecule ions and
their photofragment ions. The experimentally observed decay times indicated an
ultrafast loss of the first ligands (sub-100 fs decay times). Further we performed
a feedback control experiment on the photofragmenting CpMn(CO)3 molecular
system in order to maximize the yield of desired ionic products through pulse
modulation. The shape of the pulses obtained from optimization reflect well the
intrinsic molecular dynamics during photofragmentation and the change of the
CpMn(CO)+/CpMn(CO)
ratio shows a clear evidence for the capability of the
optimization method to find tailor-made system-specific pulses.
PACS: 82.53.Eb – Pump probe studies of photodissociation / 31.70.Hq – Time-dependent phenomena: excitation and relaxation processes, and reaction rates / 82.50.-m – Photochemistry / 82.50.Nd – Control of photochemical reactions / 82.53.-k – Femtochemistry
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
