Thomas--Reiche--Kuhn Correction for Truncated Configuration Interaction Spaces: Case of Laser-Assisted Dynamical Interference

TL;DR

This paper introduces a Thomas--Reiche--Kuhn correction to the TDCIS method in velocity gauge, improving size consistency and predicting a new laser-controlled dynamical interference effect in atomic photoionization.

Contribution

It develops an effective potential based on the sum rule to include virtual couplings, enhancing the velocity gauge TDCIS approach and enabling the prediction of novel interference phenomena.

Findings

Effective potential improves size consistency in velocity gauge TDCIS.

Comparison shows better agreement with length gauge results.

Prediction of a new two-color field controlled dynamical interference effect.

Abstract

The Thomas--Reiche--Kuhn sum rule is used to form an effective potential that is added to the time-dependent configuration interaction singles (TDCIS) equations of motion in velocity gauge. The purpose of the effective potential is to include virtual coupling from singles to doubles, which is required for size-consistent velocity gauge TDCIS results. The proposed method is compared to length gauge TDCIS results for laser-assisted photoionization. Finally, a novel dynamical interference effect controlled by two-color fields is predicted for atomic targets.