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Assuming two degenerate photons that are linearly polarized, the TPA cross section (σ$_{TPA}$) can be calculated using the imaginary part of the third-order response property as
参考文献
Silverstein, D. W.; Jensen, L. J. Chem. Phys. 2012, 136, 064111.
Beerepoot, M. T. P.; Friese, D. H.; List, N. H.; Kongsted, J.; Ruud, K. Phys. Chem. Chem. Phys. 2015, 17, 19306−19314