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We theoretically study the reconstruction of attosecond beating byinterference of two-photon transitions (RABBITT) in strongly polar molecules.The time-dependent energy of a polar molecule in the IR field gives rise to anadditional dipole-laser coupling contribution to the sideband delay. In atime-independent picture this translates to the initial state being insuperposition of IR-dressed states. We extend the recently developedtime-independent molecular R-matrix method to include the additionalinterfering ionization pathways arising from the IR-dressed initial state andobtain very good agreement with a reference non-perturbative time-dependentRABBITT simulation. Finally, we discuss the asymptotic behaviour of suchionization amplitudes and recover a known approximate asymptotic formula forthe dipole-laser coupling delay derived earlier in the context of attosecondstreaking. At low photon energies the dipole-laser coupling contributessignificantly even in an unoriented molecular sample.

Dipole-laser coupling delay in two-color (RABBITT) phoionization of polar molecules