Sternheimer equation - TDDFT.org
Sternheimer equation - TDDFT.org
Sternheimer equation - TDDFT.org
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What is non-linear optics?<br />
Polarizability (linear optics)<br />
absorption, refraction<br />
Hyperpolarizability: second-harmonic generation (SHG) etc.<br />
Consider only perturbative processes via Taylor expansion of dipole moment.<br />
Not high-harmonic generation!