Journal article
Changes of the electronic structure along the internuclear coordinate studied by ultrafast photoelectron spectroscopy: the 2¹Σµ⁺ Na₂ double-minimum-state



Publication Details
Authors:
Wollenhaupt, M.; Assion, A.; Graefe, O.; Liese, D.; Sarpe-Tudoran, C.; Winter, M.; Baumert, T.
Publication year:
2003
Journal:
Chemical Physics Letters
Pages range:
457-464
Volume number:
376
Start page:
457
End page:
464
ISSN:
0009-2614

Abstract
In a two-color femtosecond pump-probe experiment photoelectron spectra were detected to map the nuclear wave packet in the 2(1)Sigma(u)(+) Na-2 double-minimum state. The wave packet serves as a local probe for the R-dependent ionization probability. The pump photon energy of 3.65 eV allows to access a range of internuclear distances from 3 to 9Angstrom. The bound 1(2)Sigma(g)(+) and the repulsive 1(2)Sigma(u)(+) ionic states are accessible with the probe photon energy of 4.68 eV. Energy-resolved photoelectron measurements permitted to rule out competing ionization pathways. Our results show that for the bound ionic state the ionization probability at the outer turning point is 4.0+/-0.4 times larger than that at the inner turning point. (C) 2003 Elsevier B.V. All rights reserved.


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