Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.31: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
STIMULATED VARIATION OF THE MECHANISM OF Ba2+ IONS FORMATION DURING MULTIPHOTON IONISATION OF ATOMS IN VISIBLE SPECTRAL RANGE — •Vasyl Suran and Ivan Bondar — Physical Department of Uzhgorod National University, Voloshin str., 54, Uzhgorod 88000, Ukraine
The main goal of our work is the creation of conditions for realization of direct two-electron mechanism of Ba2+ ions formation in visible spectral range. The idea of experimental setup consists in following: during ionization of Ba atoms by visible laser radiation we realized the strong additional perturbation of atoms by laser radiation of other frequency range. The radiation of the second harmonic of YAG laser was used for ionization and the radiation of laser on colour centres CCL (8500−8950 cm−1) was used for perturbation of Ba atoms.
At the frequency 8880 cm−1 one photon transition between 5d6p1P10 and 6s7d1D2 states takes place. In the vicinity of this frequency the dynamic polarizability of these states has large absolute values and strongly depend on frequency of CCL radiation. That’s why in the vicinity of this frequency the strong perturbation of these states conditioned by ac-Stark effect manifestation have to take place. The results of our experiments showes that excitation of strongly perturbed in result of ac-Stark effect of 6s7d1D2 and 5d6p1P10 states leads to strong enhancement in the yield of Ba2+ ions during the ionization in visible spectral range as well. So, the obtained results show the realization of direct two-electron mechanism of doubly-charged ions formation under the circumstances of performed experiments.