A theoretical study of the orientation-dependent attoclock shift in photoelectron momentum distributions generated by ionization of ${\mathrm{HeH}}^{+}$ by a counter-rotating two-color bicircular laser field is presented. Solutions of the two-dimensional time-dependent Schrödinger equation are extrapolated to the adiabatic limit and compared to two-step trajectory models. The trajectory models are sensitive to the choice of the tunnel exit point, which depends on the dipole moment and polarizability tensor of the molecule. Using a suitable trajectory model, we are thus able to reconstruct these molecular properties from the momentum distributions within about 7% deviation from the exact values.

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• Atomic & molecular structure
• Stark effect
• Strong field ionization & excitation
• Ionized molecules
• Molecules
• Polarizability
• Adiabatic approximation
• Dipole approximation
• First-principles calculations
• Schroedinger equation
• Semiclassical methods
• Strong-field approximation