期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 6, 期 23, 页码 5353-5361出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b413635g
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Interferences in vibrational wave packets of Br-2 molecules are controlled in the presence of a solid Ar environment that provides decoherence. By applying a negatively or positively chirped excitation pulse, one can set the clock backward, respectively forward, in the wave packet propagation. Based on this mechanism, we present a general scheme to record vibrational decoherence. Wave packets are spatially focused at T-opt by applying negatively chirped pulses. From the focussing contrast, we determine a vibrational dephasing time on the B state of T-deph(vib) = 3 ps. We use positively chirped pulses to bring the formation of fractional revival structures forward with respect to T-deph(vib). By exciting four vibrational levels with such a pulse, we observe a 1/6 revival indicating the vibrational coherence time T-deph(4) for exactly four levels. The required chirp prolongs the pulse duration by a factor of ten to Deltatau = 300 fs. Electronic dephasing T-deph(el) restricts the revival control efficiency to parts of the pulse with Deltatau < T-deph(el), which allows to derive T-deph(el) > 300 fs.
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