Resonant coherent excitation of 2s electron of Li-like Fe ions to the n=3 states

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 230; no. 1-4; pp. 90 - 95
• Main Authors: Nakai, Yoichi, Ikeda, T., Kanai, Y., Kambara, T., Fukunishi, N., Komaki, K., Kondo, C., Azuma, T., Yamazaki, Y.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2005
• Subjects: Channeling; Electronic excitation and ionization of atoms; Resonant coherent excitation; 34.50.Fa; Resonant coherent excitation; Channeling; Electronic excitation and ionization of atoms; 61.85.+p
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/j.nimb.2004.12.023

We observed resonant coherent excitation of the 2s electron to the n=3 states of 83.5MeV/u Li-like Fe23+ ions planar-channeling in the (22¯0) plane of a Si crystal. A survival fraction of the Li-like ions was measured as a function of the angle between the incident beam and the [001] axis. Clear resonance dips corresponding to the transitions of a 2s electron to all the n=3 states were observed. The transition of each resonance dip was identified by comparing with spectroscopic data. The resonance dips at the transition energies corresponding to the optically forbidden 2s1/2–3s1/2, 2s1/2–3d3/2 and 2s1/2–3d5/2 transitions were observed as well as the resonance dips at transition energies corresponding to the optically allowed 2s1/2–3p1/2 and 2s1/2–3p3/2 transitions.