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We discuss the mechanism by which the inclusion of multielectron polarizationimproves the solution of the time-dependent Schr\"{o}dinger equation (TDSE) forthe oriented CO molecule in a strong external laser pulse within thesingle-active-electron (SAE) approximation. A challenging problem of using theSAE approximation is that the active electron, instead of undergoingionization, may be driven by the external field to lower-lying orbitals. Forthe oriented CO molecule, dipole coupling to the lower-lying bound states ofthe potential depends on the orientation angle, thereby affecting theorientation-dependent ionization dynamics. By including multielectronpolarization, the external field is turned off within the molecular radius,thereby minimizing dipole coupling of the highest occupied molecular orbital tothe lower-lying states of the potential. We discuss how turning off theexternal field within an appropriate molecular radius without accounting forthe induced dipole term in the effective potential beyond this radial cut-offdistance, constitutes an effective and accurate approach to describestrong-field ionization of CO and to minimize dipole coupling to lower-lyingbound states.

Effect of multielectron polarization in strong-field ionization of the oriented CO molecule