Interference between multi-step transitions in exotic atoms

Zoltan Fried, Richard J. Tansey

M.I. Podgoretskii, O.A. Khrustalev

Zhong Jian

Autoionizing states of Eu atoms were experimentally studied by multi step excitation with several combined of polarized laser.The results showed the influence of laser polarizability on the transition property and total ion products in process of multi step excitation and ionization for larger J value complex atoms in ground state.

Fang Da

Based on the method of expanding the wave function with eigenstates, the production of ions in the procedure of three step resonance excitation with polarized lasers were calculated theoretically under the condition that the final states of transitions were autoionizing states. The influences of polarization of lasers on the efficiency of multi step resonance excitation of complex atoms were discussed also.

Grigory Ya. Korenman

Divya Bharti, David Atri-Schuller, Gavin Menning +6 more

Reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) is a technique that can be used to determine the phases of atomic transition elements in photoionization processes. In the traditional RABBITT scheme, the so-called asymptotic approximation considers the measured phase as a sum of the Wigner phase linked to a single-photon ionization process and the continuum-continuum phase associated with further single-photon transitions in the continuum. In this paper, we extend the asymptotic approximation to multi-sideband RABBITT schemes. The predictions from this approximation are then compared with results obtained by an ab initio calculation based on solving the time-dependent Schr\"odinger equation for atomic hydrogen.