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We investigate attosecond time delays in the emission of photoelectrons usinga hierarchy of models of the $CO_2$ molecule including the strong fieldapproximation, Coulomb-scattering, short-range parts of the molecularpotential, Hartree and Hartree-Fock descriptions. In addition, we present an{\it ab initio} calculation based on quantum-chemical structure in combinationwith strong-field techniques, which fully includes multi-electron exchange andcorrelation. Every single of these model constituents is found to modify delayson the scale of 10 as or more, with exchange and correlation having the mostpronounced effect.

Potentials, exchange, and correlation in attosecond photoemission delays