2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99196One-photon and Raman type interactions between two-level atoms and narrow-band light are considered. We give some exactly solvable models of these processes when only one-photon Fock states are involved in the evolution. Possible application of these models for generation and transformation of entangled states of the W-class, some of which demonstrate hierarchy structure, are discussed. Finally, we consider preparation of entangled chains of atomic ensembles.5 pages, submitted to PLAQuantum Physicstext