On February 28, 1928, physicist Sir Chandrasekhara Venkata Raman unveiled the Raman Effect, clinching the Nobel Prize two years later. This optical marvel explains how light changes when scattering off molecules, marking a milestone in spectroscopy.
In simple terms, monochromatic light—like from a laser—hits a sample. Most photons scatter unchanged (Rayleigh scattering), but a fraction interacts with molecular vibrations, altering their frequency. Stokes lines show energy loss; anti-Stokes, energy gain.
Raman’s insight came from observing sunlight through a diamond aboard a ship, later verified in his Kolkata lab. No complex tools needed—just genius observation.
Its impact? Raman spectroscopy identifies materials non-destructively. Jewelers verify gems, forensic experts analyze traces, and astronomers study distant planets. Medical breakthroughs include real-time tissue analysis during surgeries.
India’s National Science Day commemorates this since 1986. The 2026 theme, ‘Women in Science: Catalysts for Developed India,’ highlights trailblazers like Janaki Ammal and Tessy Thomas amid nationwide programs.
From crystal lattices to biological cells, the Raman Effect unlocks hidden worlds. Raman’s legacy endures, inspiring generations to probe light’s secrets and fuel innovation.