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Article

Metastable Ar17+ (2s) production by Stark-assisted resonant coherent excitation

Journal of Physics B: Atomic, Molecular and Optical Physics. 2015. Vol. 48. No. 14-4026. P. 1-7.
Nakano Y., A.A. Sokolik, Stysin A., Nakai Y., Komaki K., Takada E., Murakami T., Azuma T.

We report on the selective production of the 2s metastable state of 390-MeV u−1 H-like Ar17+ions by the resonant coherent excitation (RCE). The RCE to the 2s state was achieved by using Stark mixing of n = 2 states under planar channeling conditions in a 1-m thick Si crystal. The population of the 2s state was quantitatively estimated from the ionization probability in a stripper foil installed 50 mm downstream of the crystal. The 2s population was found to be 0.05 of the total number of Ar17+ ions at the stripper. The result is in good agreement with a theoretical calculation performed with the density matrix approach.