Landsberg conducted pioneering studies on the vibrational scattering of light in crystals beginning in 1926. In 1928, Landsberg and Mandelstam discovered a phenomenon of combinational scattering of light (this phenomenon became known as Raman scattering or the Raman effect independently discovered by C. V. Raman and K. S. Krishnan in liquids). Landsberg discovered the fine structure in Rayleigh scattering. In 1931, he discovered a phenomenon of selective scattering of light.