Vibrational wave packet dynamics in the silver tetramer probed by NeNePo femtosecond pump-probe spectroscopy |
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| Authors: | H Hess KR Asmis T Leisner L Wöste |
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| Institution: | Institut für Experimentalphysik, Freie Universit?t Berlin, D-14195 Berlin, Germany, DE
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| 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
e2νχ
eχ
e of 2.65 cm-1 for the active vibrational mode.
Received 30 November 2000 |
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| Keywords: | PACS 36 40 -c Atomic and molecular clusters – 33 15 Mt Rotation vibration and vibration-rotation constants – 33 80 Eh Autoionization photoionization and photodetachment |
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