Vibrational perturbations of W(CO)6 trapped in a molecular lattice probed by linear and nonlinear spectroscopy.

摘要: Vibrational dynamics of the T1u CO stretching mode tungsten hexacarbonyl is explored when molecule embedded in a nitrogen matrix at low temperature. Experiments combined infrared (IR) absorption spectroscopy and IR stimulated photon echoes femtosecond time scale. W(CO)6 found to be trapped two main families sites differing by their symmetry (called hereafter Oh D2h sites). In sites, vibrational coherence strongly temperature dependent, exhibiting coupling with librational phonons lattice. Perturbation results splitting band three components. Each component inhomogeneously broadened, dephasing times tens picoseconds, weakly coupled lattice phonons. solid krypton are performed compare effect atomic diatomic host lattices. Dephasing Kr does not depend on remains hundreds highlighting molecular origin ...