Abstract
One color pump–probe and photon-echo experiments have been performed on the CO stretching mode of W(CO) 6 at about 1982 cm −1 in organo-mineral xerogels. Over the whole temperature range studied, from room temperature to 5 K, the population lifetime T 1 remains constant when the vibrational dephasing time T 2 lengthens slightly. The temperature evolution of the pure dephasing time T ∗ 2 reveals two activation energies corresponding to molecular motions of the guest in the xerogel pore.
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