Distilling two-center-interference information during tunneling of aligned molecules with orthogonally polarized two-color laser fields

Alignment dependence of photoelectron momentum distributions for diatomic molecules N$_2$ in strong elliptical laser fields

“…We solve the TDSE of i Ψ(r, t) = H(t)Ψ(r, t) numerically through the spectral method [57]. The numerical details can be found in [35]. In our simulations, for N 2 , we select the eigenstate of H 0 with 3σ g symmetry as the initial state, and for the model Ar atom, the eigenstate of the corresponding H 0 with 1s symmetry is selected.…”

“…Then the complex momentum k s can be expressed as k s = k r s +ik i s with k r s = [p z +A r,z (t s )] e z +[p y +A r,y (t s )] e y and k i s = A i,z (t s ) e z + A i,y (t s ) e y . Accordingly, the interference term sin(k s • R/2) has the following form With assuming |p z +A r,z (t s )| ∼ 0 and |p y +A r,y (t s )| ∼ 0, as in [35], we have k s ≈ ik i s . By Eq.…”

“…A similar expression to Eq. ( 13) have been used in [35] to analyze effects of two-center interference in ATI in orthogonal two-color laser fields. The approximate expression of Eq.…”

“…For aligned symmetric diatomic molecules [31] with a not very large internuclear distance R, it has been shown that the interference of the electronic wave between these two atomic centers of the molecule under the barrier induces the remarkable increase of ionization yields of the target molecule in comparison with its partner atom with a similar ionization potential I p [32][33][34]. Further theoretical studies showed that this effect has important influences on alignment dependence of ATI [35,36], HHG [37] and NSDI [38] of symmetric molecules, as well as ATI and HHG of oriented asymmetric molecules [39].…”

Characterizing Sub-Cycle Electron Dynamics of Polar Molecules by Asymmetry in Photoelectron Momentum Distributions

“…The OTC electric field E(t) used here consists of a strong fundamental field E x (t) and a weak secondharmonic field E y (t), with [28]…”