we obtain τ loc ≈ 45 fs and B ≈ 1.51 for CIS, and τ loc ≈ 51 fs and B ≈ 1.25 for CISD. Thus, this analysis also yields a similar localization time (∼50 fs) for CIS and CISD, with slightly larger extent of localization for CISD (corresponding to a smaller B value).