Second-order nonlinear optical properties of two chalcone derivatives: insights from sum-over-states - Custodio, Jean M. F.; D'Oliveira, Giulio D. C.; Gotardo, Fernando; Cocca, Leandro Henrique Zucolotto; De Boni, Leonardo; Perez, Caridad N.; Napolitano, Hamilton B.; Osorio, Francisco A. P.; Valverde, Clodoaldo (Physical Chemistry Chemical Physics, 2021)