In:
The Journal of Chemical Physics, AIP Publishing, Vol. 123, No. 5 ( 2005-08-01)
Kurzfassung:
Time- and frequency-resolved pump-probe measurements on NeBr2 have been performed to better characterize its fragmentation dynamics on the B electronic state for vibrational levels in the energy region of the transition from direct vibrational predissociation to intramolecular vibrational relaxation dynamics. Above ν′=20 of the Br2 stretching mode, it was observed that the dependence of lifetime on the vibrational quantum number deviates from the energy-gap law by leveling off in the range of 10ps & lt;τ & lt;20ps. In addition to measuring the appearance of Br2 product state levels, we were able to monitor the decay of the initially excited NeBr2 via B→E transitions of the complex. These transitions are shifted 20cm−1 to lower energy from the free Br2 resonances, indicating an E state Ne–Br2 bond energy of 82cm−1. Measurements of NeBr2 vibrational predissociation via the Δν=−2 channel were also performed for ν′=27, 28, and 29. The closing of the Δν=−1 channel leads to an increase in the lifetimes of these vibrational levels. A new Nd:yttrium aluminum garnet pumped dual optical parametric oscillator/optical parametric amplifier system is described that allows us to conveniently record time-delayed pump-probe spectra with 2-cm−1 spectral resolution and 15-ps time resolution.
Materialart:
Online-Ressource
ISSN:
0021-9606
,
1089-7690
Sprache:
Englisch
Verlag:
AIP Publishing
Publikationsdatum:
2005
ZDB Id:
3113-6
ZDB Id:
1473050-9
Bookmarklink