Volume 120, Number 6, December 2017
|Number of page(s)||6|
|Section||Atomic, Molecular and Optical Physics|
|Published online||01 March 2018|
Evidence of circular Rydberg states in beam-foil experiments: Role of the surface wake field
1 Department of Applied Physics, Delhi Technological University - Bawana road, New Delhi 110042, India
2 Inter University Accelerator Centre - Aruna Asaf Ali Marg, New Delhi 110067, India
Received: 20 December 2017
Accepted: 13 February 2018
We have employed the concept of the surface wake field to model the formation of the circular Rydberg states in the beam-foil experiments. The experimental studies of atomic excitation processes show the formation of circular Rydberg states either in the bulk of the foil or at the exit surface, and the mechanism is explained by several controversial theories. The present model is based on the interesting fact that the charge state fraction as well as the surface wake field depend on the foil thickness and it resolves a long-standing discrepancy on the mechanism of the formation of circular Rydberg states. The influence of exit layers is twofold. Initially, the high angular momentum Rydberg states are produced in the last layers of the foil by the Stark switching due to the bulk wake field and finally, they are transferred to the circular Rydberg states as a single multiphoton process due to the influence of the surface wake field.
PACS: 34.35.+a – Interactions of atoms and molecules with surfaces / 34.90.+q – Other topics in atomic and molecular collision processes and interactions (restricted to new topics in section 34) / 34.50.Fa – Electronic excitation and ionization of atoms (including beam-foil excitation and ionization)
© EPLA, 2018
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