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Mahesh

29/02/24 07:20 AM IST

National Science Day

In News
  • In 1986, the Government of India, under then Prime Minister Rajiv Gandhi, designated February 28 as National Science Day to commemorate the announcement of the discovery of the “Raman Effect”.
About CV Raman
  • Raman was born to a family of Sanskrit scholars in Trichy (present-day Tiruchirapalli) in the Madras Presidency in 1888.
  • At the age of only 16, He received a BA degree from Presidency College in Madras, and was placed first in his class.
  • While studying for his MA degree, at the age of 18, he got published in the Philosophical Magazine: this was the first research paper ever published by Presidency College.
  • While still a full-time civil servant, Raman began after-hours research at the Indian Association for the Cultivation of Science (IACS).
  • Raman raised the profile of IACS, doing some award-winning research as well as conducting public demonstrations with charisma.
  • At the age of 29, he finally resigned from his civil services job and took up a professorship in Presidency College, Calcutta.
About the discovery
  • By 1921, CV Raman had gained a solid reputation as a top scientific mind both in India and in the West.
  • That year, he made his first journey to England. It was on the return journey that Raman would make an observation that would change his life and science forever.
  • While passing through the Mediterranean Sea, Raman was most fascinated by the sea’s deep blue colour.
  • Dissatisfied with the then-accepted answer (“the colour of the sea was just a reflection of the colour of the sky”), his curious mind delved deeper.
  • He soon found out that the colour of the sea was the result of the scattering of sunlight by the water molecules.
  • Fascinated by the phenomenon of light-scattering, Raman and his collaborators in Calcutta began to conduct extensive scientific experiments on the matter – experiments that would eventually lead to his eponymous discovery.
Raman effect
  • Raman Effect refers to the phenomenon in which when a stream of light passes through a liquid, a fraction of the light scattered by the liquid is of a different colour.
  • This happens due to the change in the wavelength of light that occurs when a light beam is deflected by molecules.
  • In general, when light interacts with an object, it can either be reflected, refracted or transmitted.
  • One of the things that scientists look at when light is scattered is if the particle it interacts with is able to change its energy.
  • The Raman Effect is when the change in the energy of the light is affected by the vibrations of the molecule or material under observation, leading to a change in its wavelength.
Significance of the discovery
  • CV Raman’s discovery took the world by storm as it had deep implications far beyond Raman’s original intentions.
  • As Raman himself remarked in his 1930 Nobel Prize speech, “The character of the scattered radiations enables us to obtain an insight into the ultimate structure of the scattering substance.” For quantum theory, in vogue in the scientific world at the time, Raman’s discovery was crucial.
  • The discovery would also find its use in chemistry, giving birth to a new field known as Raman spectroscopy as a basic analytical tool to conduct nondestructive chemical analysis for both organic and inorganic compounds.
  • With the invention of lasers and the capabilities to concentrate much stronger beams of light, the uses of Raman spectroscopy have only ballooned over time.
  • Today, this method has a wide variety of applications, from studying art and other objects of cultural importance in a non-invasive fashion to finding drugs hidden inside luggage at customs.
Source- Indian Express

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