Abstract
The process of reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) reveals the target atom electronic structure when one of the transitions proceeds from below the ionization threshold. Such an under-threshold RABBITT resonates with the target bound states and thus maps faithfully the discrete energy levels and the corresponding oscillator strengths. We demonstrate this sensitivity by considering the Ne atom driven by the combination of the XUV and IR pulses at the fundamental laser frequency in the 800 and 1000 nm ranges.
Highlights
The RABBITT traces of the Ne atom at the IR frequencies of ω = 1.21, 1.22, and 1.23 eV are shown in Figure 4
We run an extensive set of numerical time-dependent Schrödinger equation (TDSE) simulations over the two spectral ranges near the central wavelengths of 800 and 1000 nm with a fine increment ∆ω = 5 meV
We made a comparison of our numerical results with predictions of the analytic lowest order perturbation theory (LOPT) expressions utilizing accurate bound state energies and oscillator strengths
Summary
The process of reconstruction of attosecond beating by the interference of two-photon transitions (RABBITT) [1,2] has become a widely used tool for attosecond chronoscopy of atoms [3], molecules [4,5] liquids [6], and solids [7,8]. In RABBITT, XUV driven primary ionization is augmented by secondary IR photon absorption or emission The latter IRdriven processes lead to the same final continuous state whose population depends on the relative phase of the absorption/emission amplitudes. In this process, the (2q − 1)ω photon absorption promotes the target electron to a discrete excited state below the threshold En < 0. A rather large XUV spectral width employed in [9] did not allow for an accurate uRABBITT phase determination in the 1000 nm wavelength range when SB18 was expected to overlap with a group of narrowly spaced target states. In both cases, the resonant uRABBITT phase maps faithfully the target atom electronic structure, allowing access to the bound state energies and the corresponding oscillator strengths
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