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Ultrafast Fragmentation and Vibrational Dynamics of Triatomic Hetero‐ and Homonuclear Alkali Metal Clusters
Author(s) -
RosendoFrancisco Porfirio,
Lupulescu Cosmin,
Baptist Bernd,
Vajda ŠTefan
Publication year - 2000
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200000096
Subject(s) - chemistry , excited state , atomic physics , excitation , fragmentation (computing) , triatomic molecule , homonuclear molecule , photodissociation , photochemistry , inorganic compound , molecule , physics , organic chemistry , quantum mechanics , computer science , operating system
The one‐color femtosecond pump and probe spectroscopical technique was employed to study the fragmentation kinetics and vibration dynamics of the dissociative excited states of alkali trimer clusters K 2 Na, K 3 and Na 2 K located in the spectral region between 730 and 840 nm. The electronically excited states were populated by a pump pulse via one‐photon absorption. The temporal evolution of the excited state was then monitored by ionizing the particle at a variable delay with a two photon transition. The lifetimes of the predissociated excited states strongly depend on the excitation wavelengths: 2.8‐5.1 ps for K 2 Na, 7.5‐9.8 ps for K 3 , and 2.5‐5.8 ps for Na 2 K. Furthermore, the dominant fragmentation channels were identified as well. In the case of the Na 2 K trimer a clear wavepacket dynamics with an oscillation period of about 490 fs was observed at an excitation wavelength of 770 nm. In the case of the K 3 and K 2 Na trimers, no pronounced oscillatory ion signal indicative of a vibrational dynamics was observed at the applied wavelength region.