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Ultrafast Energy Redistribution in Photoexcited Sodium‐Ammonia Clusters
Author(s) -
Schulz Claus Peter,
Scholz Axel,
Hertel Ingolf V.
Publication year - 2004
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/tey2-wj8q-lmft-u2v7
Subject(s) - chemistry , molecule , femtosecond , chromophore , atom (system on chip) , redistribution (election) , acceptor , excitation , photodissociation , atomic physics , photochemistry , ultrashort pulse , laser , chemical physics , physics , electrical engineering , organic chemistry , engineering , politics , computer science , law , political science , optics , embedded system , condensed matter physics
The dynamics in photoexcited Na(NH 3 ) n clusters up to n = 20 using femtosecond laser pump and probe techniques are investigated. It is found that electronic excitation energy of the metal atom chromophore is transferred to internal vibrations of the surrounding ammonia solvent molecules. The transfer time strongly depends on the number of ammonia molecules bound to the sodium atom, decreasing from 2000 ps when only one ammonia molecules is attached to the metal atom down to a limiting value of about 100 fs for Na(NH 3 ) 10 . These results can be understood in terms of an internal energy transfer where the rates are governed by the density of states and the Franck‐Condon overlap of the acceptor modes.