PHOTON--PLASMON TRANSITION 2S/sub 1/2/--1S/sub 1/2/ IN HYDROGEN-LIKE ATOMS.

TWO-QUANTUM PHOTON--PLASMON 2S/sub 1/2/--1S/sub 1/2/ TRANSITION.

The Two-Quantum Photon-Plasmon 2S ½ -1S ½ Transition.

The hydrogenic 2s→1s two-photon emission

Magic Wavelengths for the 1S-2S and 1S-3S Transitions in Hydrogen Atoms

Calculation of the 1s–2s two-photon excitation cross-section in atomic hydrogen

Two-photon Decay of 2s Level of Hydrogen