2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18971We identify the W center in self-implanted crystalline Si with the three-membered self-interstitial cluster I_3 on the basis of first-principles density-functional-theory calculations matching all the known experimental signatures of the center (emission energy, extrinsic energy levels, activation energy and dissociation energy, local vibrational structure, and symmetry).RevTeX 4 pages, 2 embedded ps figuresMaterials Sciencetext