Changes of the electronic structure along the internuclear coordinate studied by ultrafast photoelectron spectroscopy: the 21Σu+ Na2 double-minimum state
✍ Scribed by M. Wollenhaupt; A. Assion; O. Graefe; D. Liese; C. Sarpe-Tudoran; M. Winter; T. Baumert
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 314 KB
- Volume
- 376
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
In a two-color femtosecond pump-probe experiment photoelectron spectra were detected to map the nuclear wave packet in the 2 1 R þ 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 9 A A. The bound 1 2 R þ g and the repulsive 1 2 R þ 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 AE 0.4 times larger than that at the inner turning point.