Vibrational wave packet dynamics in the silver tetramer probed by NeNePo femtosecond pump-probe spectroscopy

Abstract:

We present results on the ultrafast dynamics of mass-selected neutral Ag4 clusters using NeNePo (negative ion - neutral - positive ion) femtosecond pump-probe spectroscopy. One-color pump-probe spectra of the Ag4 -/Ag4/Ag4 + system measured at 385 nm and an internal cluster temperature of 20 K display a complex beat structure over more than 60 ps. The oscillatory structure is attributed to vibrational wave packet dynamics in an excited “dark" state of neutral Ag4. A dominant 740 fs wave packet period as well as wave packet dephasing and rephasing are observed in the spectra. Fourier analysis of the spectra yields a group of frequencies centered around 45 cm-1 and an anharmonicity χ eχ eχ e of 2.65 cm-1 for the active vibrational mode.

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Received 30 November 2000

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Hess, H., Asmis, K., Leisner, T. et al. Vibrational wave packet dynamics in the silver tetramer probed by NeNePo femtosecond pump-probe spectroscopy. Eur. Phys. J. D 16, 145–149 (2001). https://doi.org/10.1007/s100530170079

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  • PACS. 36.40.-c Atomic and molecular clusters – 33.15.Mt Rotation, vibration, and vibration-rotation constants – 33.80.Eh Autoionization, photoionization, and photodetachment