[1] The main emphasis of his work was broadly considered theory of oscillations, which included optics and quantum mechanics.

Beginning from 1926, Mandelstam and Landsberg initiated experimental studies on vibrational scattering of light in crystals at the Moscow State University.

However, according to the Physics Nobel Committee, Mandelstam and Landsberg were unable to provide an independent, complete interpretation for the discovery, as they only later cited Raman's article.

Raman's method was further applied with great success in different fields of molecular physics, for example in the composition analysis of liquids, gases, and solids, and provided significant insight on nuclear spins.

[9] Mandelstam founded one of the two major schools of theoretical physics in the Soviet Union (another being due to Lev Landau).