C. V. Raman

Chandrasekhara Venkata Raman (7 November 1888 – 21 November 1970), universally known as C. V. Raman, was an Indian physicist whose discovery of the Raman effect — the inelastic scattering of light by molecules — earned him the Nobel Prize in Physics in 1930, making him the first Asian and the first non-white scientist to receive a Nobel Prize in the sciences.

Born in Tiruchirappalli, in the Madras Presidency of British India (present-day Tamil Nadu), Raman demonstrated exceptional academic ability from childhood. He completed his undergraduate and postgraduate studies at Presidency College, Madras, where he published his first research paper at the age of eighteen. Despite his early scholarly promise, he initially pursued a career in the Indian Finance Department before resigning to devote himself entirely to scientific research.

Early life and education

Raman was born into a Tamil Brahmin family; his father, Chandrasekhara Ramanathan Iyer, was a lecturer in mathematics and physics. The intellectually stimulating household exposed Raman to science from a young age. He passed his matriculation examination at the age of eleven and completed his Bachelor of Arts degree with honours in physics from Presidency College, Madras, in 1904, standing first in his class. He obtained his Master of Arts degree from the same institution in 1907, again with the highest distinction.

Unable to travel to England for doctoral studies due to a medical assessment that deemed him unfit for the journey, Raman remained in India, a circumstance that ultimately directed his path toward independent research.

Career and scientific contributions

Indian Finance Department and early research

In 1907, Raman joined the Indian Finance Department as an assistant accountant general, first in Calcutta (present-day Kolkata). Despite the demands of government service, he conducted experiments in his spare time at the laboratories of the Indian Association for the Cultivation of Science (IACS) in Calcutta, founded in 1876. His early work there focused on the acoustics of stringed instruments and the physiology of human hearing.

Academic appointments

In 1917, Raman resigned from government service to accept the newly created Palit Professorship of Physics at the University of Calcutta, a decision that represented a substantial financial sacrifice. He held this position until 1933, building one of the most productive physics research groups in colonial India. In 1933 he moved to Bangalore to become the first Indian director of the Indian Institute of Science (IISc), a post he held until 1937. He subsequently founded the Raman Research Institute in Bangalore in 1948, which he directed until his death.

Discovery of the Raman effect

On 28 February 1928, Raman and his collaborator K. S. Krishnan announced the experimental observation of a new type of light scattering in which photons interacting with a material lose or gain energy, causing a shift in the wavelength of the scattered light. This phenomenon, initially termed the new radiation in their report, rapidly became known worldwide as the Raman effect. The discovery was made using sunlight focused through a telescope and a series of complementary filters — a notably simple experimental apparatus that highlighted Raman's ingenuity.

The theoretical basis for the effect had been anticipated independently by the Austrian-Czech physicist Adolf Smekal in 1923, but experimental confirmation was Raman's achievement. Soviet physicists Grigory Landsberg and Leonid Mandelstam reported a similar observation in crystals almost simultaneously, leading to some dispute over priority, though Raman's publication is generally regarded as primary.

The Raman effect has become the foundation of Raman spectroscopy, a widely used analytical technique in chemistry, materials science, pharmaceuticals, and forensic science.

Other research areas

Beyond the Raman effect, C. V. Raman made significant contributions to the understanding of the acoustics of musical instruments — particularly Indian instruments such as the tabla and mridangam — the optics of colloidal particles, the theory of crystal dynamics, and the physiology of colour vision. His research on the blue colour of the ocean, challenging the prevailing explanation attributed to reflected sky colour, preceded the discovery of the Raman effect and illustrated his habit of pursuing questions arising from everyday observation.

Honours and recognition

Raman received numerous honours over the course of his career:

• Nobel Prize in Physics, 1930
• Fellow of the Royal Society (FRS), elected 1924
• Knight Bachelor (Sir C. V. Raman), 1929 — an honour he later ceased to use after Indian independence
• Bharat Ratna, India's highest civilian honour, 1954
• Lenin Peace Prize, 1957
• Honorary doctorates from universities across Europe, Asia, and North America

In India, 28 February — the date of the Raman effect's announcement — is observed annually as National Science Day.

Legacy

C. V. Raman is widely regarded as one of the founders of modern Indian science. His career demonstrated that world-class experimental physics could be conducted in India with limited resources, and he actively mentored a generation of Indian scientists. The Raman Research Institute in Bangalore continues to operate as an autonomous research institution. Raman spectroscopy remains a central tool in analytical chemistry, nanotechnology, and biomedical diagnostics, and the technique has been deployed on spacecraft instruments to analyse the composition of planetary surfaces.

His insistence on observational curiosity over theoretical abstraction, and his ability to derive fundamental insights from simple experimental setups, are frequently cited as defining characteristics of his scientific method.

Frequently asked questions

Is C. V. Raman the first Asian Nobel laureate in science?

Yes. When C. V. Raman received the Nobel Prize in Physics in 1930, he became the first Asian, and the first person of non-European descent, to win a Nobel Prize in any of the sciences.

Is the Raman effect the same as Rayleigh scattering?

No. Rayleigh scattering is elastic — the scattered photon retains the same energy and wavelength as the incident photon. The Raman effect involves inelastic scattering, in which the photon exchanges energy with the scattering molecule, producing a measurable shift in wavelength.

Is 28 February significant in Indian science because of C. V. Raman?

Yes. The Government of India designated 28 February as National Science Day to commemorate the announcement of the Raman effect on that date in 1928.

Is Raman spectroscopy still in active use?

Raman spectroscopy is in widespread active use in the twenty-first century, applied in fields including pharmaceuticals, materials characterisation, environmental monitoring, and planetary science.

Is the Raman Research Institute named after C. V. Raman?

Yes. Raman founded the Raman Research Institute in Bangalore in 1948 and directed it until his death on 21 November 1970; it continues to function as an independent scientific research institute.