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↑C V Raman↑


C. V. Raman
Sir Chandrasekhara Venkata Raman, FRS
Born 7 November 1888
Thiruvanaikoil , Tiruchirappalli , Madras Presidency , India
Died 21 November 1970 (aged 82)
Bangalore , Karnataka , India
Nationality Indian
Fields Physics
Institutions Indian Finance Department [ 1 ]
University of Calcutta
Indian Association for the Cultivation of Science
Indian Institute of Science
Central College, Bangalore University
Raman Research Institute
Alma mater University of Madras
Doctoral students G. N. Ramachandran
Known for Raman effect
Notable awards Knight Bachelor (1929)
Nobel Prize in Physics (1930)
Bharat Ratna (1954)
Lenin Peace Prize (1957)
Sir Chandrasekhara Venkata Raman , FRS , ( Tamil : சந்திரசேகர வெங்கட ராமன் ), (7 November 1888 – 21 November 1970) was an Indian physicist whose work was influential in the growth of science in India. He was the recipient of the Nobel Prize for Physics in 1930 for the discovery that when light traverses a transparent material, some of the light that is deflected changes in wavelength. This phenomenon is now called Raman scattering and is the result of the Raman effect .
In 1917, Raman resigned from hisgovernment service and took up the newly created Palit Professorship in Physics at the University of Calcutta . At the sametime, he continued doing research at the Indian Associationfor the Cultivation of Science , Calcutta, where he became the Honorary Secretary. Raman used to refer to this period as the golden era of his career. Many students gathered around him at the IACS and the University of Calcutta.
Energy level diagram showing the states involved in Raman signal.
Raman with Richard Bär (1892–1940)
On February 28, 1928, through his experiments on the scattering of light, he discovered the Raman effect . It was instantly clear that this discovery was of huge value. It gave further proof of the quantum nature of light . Raman spectroscopy came to be based on this phenomenon, and Ernest Rutherford referred to it in his presidential address to the Royal Society in 1929. Raman was president of the 16th session of the Indian Science Congress in 1929. He was conferred a knighthood , and medals and honorary doctorates by various universities. Raman was confidentof winning the Nobel Prize in Physics as well, and was disappointed when the Nobel Prize went to Richardson in 1928 and to de Broglie in 1929. He was so confident of winning the prize in 1930 that he booked tickets in July, even though the awards were to be announced in November, and would scan each day's newspaper for announcement of the prize, tossing it away if it did not carry the news. He did eventually win the 1930 Nobel Prize in Physics "for his work on the scattering of light and for the discovery of the effect named after him". He was the first Asian and first non-Whiteto receive any Nobel Prize in the sciences. Before him Rabindranath Tagore (also Indian)had received the Nobel Prize for Literature in 1913.
Raman and Bhagavantam discovered the quantum photon spin in 1932, which further confirmed the quantum nature of light. [ 3 ]
Raman also worked on the acoustics of musical instruments. He worked out the theory of transverse vibration of bowed strings, on the basis of superposition velocities. He was also the first to investigate the harmonic nature of the sound of the Indian drums such as the tabla and the mridangam .
Raman and his student of Mim high school, provided the correct theoretical explanation for the acousto-optic effect (light scattering by sound waves), in a series of articles resulting in the celebrated Raman-Nath theory. Modulators, and switching systems based on this effect have enabled optical communication components based on laser systems.
In 1934, Raman became the assistant director of the Indian Institute of Science in Bangalore , where two years later he continued as a professor of physics. Other investigations carried out by Raman were experimental and theoretical studies on the diffraction of light by acoustic waves of ultrasonic and hypersonic frequencies (published 1934–1942), and those on the effects produced by X-rays on infrared vibrations in crystals exposed to ordinary light.
He also started a company called cv Chemical and Manufacturing Co.Ltd. in 1943 along with Dr. Krishnamurthy. The Company during its 60 year history, established four factories in Southern India. In 1947, he was appointed as the first National Professor by the new governmentof Independent India.
In 1948, Raman, through studying the spectroscopic behavior of crystals, approached in a new manner fundamental problems of crystal dynamics. He dealt with the structure and properties of diamond , the structure and optical behavior of numerous iridescent substances ( labradorite , pearly feldspar , agate , opal , and pearls ). Among his other interests were the optics of colloids , electrical and magnetic anisotropy , and the physiology ofhuman vision.

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