R. S. Krishnan

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R.S. Krishnan
Born(1911-09-23)23 September 1911
Rappal10°24′34″N 76°16′07″E / 10.4094515°N 76.2685119°E / 10.4094515; 76.2685119,
C.V. Raman
  • Norman Feather
    • Doctoral students

    Rappal Sangameswaran Krishnan[1] (23 September 1911 – 2 October 1999) was an Indian experimental physicist and scientist. He was the Head of the department of Physics at the Indian Institute of Science and the vice chancellor of the University of Kerala. He is known for his pioneering researches on colloid optics and a discovery which is now known as Krishnan Effect.[2] He was a Fellow of the Indian Academy of Sciences, Indian National Science Academy and the Institute of Physics, London and a recipient of the C. V. Raman Prize.[3] 25 students were guided by RSKrishnan for Ph D. Dr T N Vasudevan was the 25th. Prof Vasudevan retired from Physics Dept, Calicut University died on 2 August 2021

    Biography

    A modern Cyclotron.

    Krishnan was born in a small village named Rappal, in

    Cambridge University under Sir John Cockcroft.[1] His researches at Cambridge is reported to have assisted in the development of the 37’ Cyclotron and to the observation of deuteron-induced fission in uranium and thorium.[3] The University awarded him PhD, in 1941, for his research work.[1] He conducted his thesis research under Norman Feather, a colleague of Cockcroft's and also a student of Lord Rutherford.[4]

    Krishnan returned to India the same year and joined the Physics department of the

    Bengaluru.[citation needed
    ]

    Legacy

    Working further on the

    Raman Effect, Krishnan discovered the reciprocity relations between the intensity of the horizontally polarised incident light getting scattered with horizontal polarization irrespective of the colloidal particles.[6] This is known as Krishnan (reciprocity) Effect[7] and the article was published in IISc journal on recommendation from C. V. Raman in 1936.[8] He is credited with researches on Second Order Raman Spectra in diamond and in alkali halide crystals and is reported to have successfully recorded the phenomena for the first time, using the ultraviolet (mercury 2536 Å) technique of excitation for Raman spectroscopy, a technique he developed, on which he published a number of articles in peer reviewed journals.[9][10] This is known to have provided conformation of Born's lattice dynamical theory.[3] He was the first scientist to perform Brillouin scattering experiments in diamond, crystalline and fused quartz, alumina and alkali halides and is the author of a theory on Brillouin scattering in cubic and birefringent crystals, along with his student, Chandrasekhar.[3] He also had documented investigations on thermal expansion, elastic constants and photoelastic constants of crystals and he initiated efforts on dating of Indian rock formations using nuclear geochronological techniques.[3] He was the author of a monograph, two volumes of 'Source Book on Raman Effect' and contributed chapters to several scientific texts,[3]
    besides delivering several orations.

    Krishnan served as a member of the International Committee on Ferro-electricity and sat in the International Advisory Committee for Conferences on Raman Spectroscopy.[3] He represented India in several international conferences and seminars such as the 2nd International Conference on Crystallography in Stockholm in 1951, the International Science Conference at Edinburgh, the 5th Australian Spectroscopic Conference, and the 1st International Conference on Raman Spectra on Crystals in Paris in 1965.[citation needed] His researches have been documented by way of over 500 articles published in peer reviewed national and international journals and over 60 research scholars were mentored by him, in their doctoral studies.[citation needed] Krishnan was a member of the council of the Indian Academy of Sciences from 1949 to 1955 and was its treasurer for a short period in 1955.[11] He was also a member of the London Institute of Science, and the American Physical Society and was associated with several universities in Europe and the US, as a visiting professor.[citation needed]

    Awards and honours

    The

    Indian Science Congress in 1988, four years after the Indian Institute of Science awarded him the 1984 Platinum Jubilee Distinguished Alumni Award.[3]

    Selected bibliography

    See also

    References

    1. ^ a b c d e f g h "R. S. Krishnan: an obituary" (PDF). Current Science. 1999. Retrieved 25 December 2016.
    2. ISBN 9781483191775
      .
    3. ^ a b c d e f g h i j k "Deceased Fellow". Indian National Science Academy. 2015. Retrieved 5 December 2015.
    4. ^ "Norman Feather - Session II". American Institute of Physics. 26 January 2015. Retrieved 9 June 2016.
    5. ^ "Great Teachers V.-R.S.Krishnan". Sulekha. 2015. Retrieved 5 December 2015.
    6. JSTOR 97009
      .
    7. ISBN 9788131728185
      .
    8. S2CID 198139008
      .
    9. S2CID 4126866
      .
    10. S2CID 91228159
      .
    11. ^ a b "IAS Fellow". Indian Academy of Sciences. 2015. Retrieved 5 December 2015.
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