Two-photon approximation in the theory of the electron recombination in hydrogen
Two-photon coherent control of femtosecond photoassociation
Two-photon decay of excited levels in hydrogen: the ambiguity of the separation of cascades and pure two-photon emission
Two-photon decays of highly excited states in hydrogen
Two-Photon Decays Reexamined: Cascade Contributions and Gauge Invariance
Two-photon detachment of electrons from halogen negative ions
Two-Photon Doppler cooling of alkaline-earth-metal and ytterbium atoms
Two-photon Double Ionization of H$_2$ in Intense Femtosecond Laser Pulses
Two-photon E1M1 decay of 2 3P0 states in heavy heliumlike ions
Two-photon ionization of Helium studied with the multiconfigurational time-dependent Hartree-Fock method
Two-photon photo-ionization of the Ca 4s3d 1D2 level in an optical dipole trap
Two-photon photoassociative spectroscopy of ultracold 88-Sr
Two-Photon Spectroscopy Between States of Opposite Parities
Two-step method for precise calculation of core properties in molecules
Two-time Green function method in quantum electrodynamics of high-Z few-electron atoms