L Keldysh 1965 strong-field-ionization γ_K = ω√(2I_p)/eE; modern modern foundational text + tunneling/multiphoton transition + 2024 ML-strong-field.
L Keldysh 1965 strong-field-ionization γ_K = ω√(2I_p)/eE; modern modern foundational text + tunneling/multiphoton transition + 2024 ML-strong-field.