2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47136Following an introduction which explains some basic ideas about diffraction, the semiclassical approach to diffraction in deep inelastic scattering (DIS) is outlined. Some phenomenological tests of this picture, concerning the $p_{\perp}$ and mass spectra of open charm and jet production are given.12 pages, 4 figures. Talk given at the Ringberg workshop: `New trends in HERA physics', Ringberg Castle, Bavaria, May 1997High Energy Physics - Phenomenologytext