Publications

updated link: http://dop.astrobiology.in/index.php/publications

1. L. Godfrey and K. Viswanathan, Low-cost precision high temperature controller, Indian J. Pure Appl. Phys., Vol. 22, pp. 505-7 (1984).

2. L.Godfrey and Jacob Philip, A temperature controller for crystal growth experiments of long duration, J. Phys. E: Sci.Instrum. (UK), vol. 22, pp. 516-18 (1989).

3. Johney Isaac, L. Godfrey and Jacob Philip, A low cost high precision proportional integral derivative temperature controller, Indian J. Pure Appl. Phys., vol. 29, pp. 195-197 (1991).

4. L. Godfrey, J. Philip and M.T. Sebastian, Elastic constants and high temperature elastic anomalies near 425 K in Lithium Hydrazinium Sulfate, J. Appl. Phys. (USA) , vol. 75, pp. 2393-2397 (1994). doi:10.1063/1.356260

5. L. Godfrey and J. Philip, Numerical technique for bond correction in ultrasonic measurements, Acoust. Lett. (UK) Vol. 19, pp. 11-14, (1995).

6. L. Godfrey and J. Philip, Ultrasonic measurement of the Elastic constants of LiKSO₄ between 300 and 370 K, Solid State Commun. (UK), vol. 97, pp. 635-638, (1996).

7. L. Godfrey and J. Philip, Phase Transitions in Lithium Ammonium Sulfate below room temperature: An Ultrasonic Study, Phys. Rev. B (USA) Vol. 54, pp. 15708-713, (1996).

8. George Varughese, A. Santhosh Kumar, Leesal Iype, A. V. Alex, Jacob Philip and L. Godfrey. Elastic properties of NLO sulphamic acid crystals. Proceedings of DAE-BRNS National Laser Symposium Nov 14-16, 2002, pp 493-494, Allied Publishers (2002).

9. George Varughese, Lini Jose, Priya S. Nair, Anu Geeth and L. Godfrey, Thermal Studies of Phase Transition in NLO Sulphamic acid Crystal. Proceedings of DAE-BRNS National Laser Symposium December 22-24, 2003, pp 325-326, Allied Publishers (2003).

10. R. Rajesh, A. Santhosh Kumar, Leesal Iype, Georgekutty Joseph and Godfrey Louis, Growth and DC Conductivity studies in MnSeO₄.2H₂O single Crystal, Indian Journal of Physics, Vol. 79, pp 691-693 (2005).

11. Georgekutty Joseph, A. Santhosh Kumar, Leesal Iype and Godfrey Louis, AC conductivity and dielectric studies of K₃Na(SeO₄)₂ single crystals in the high temperature region , Indian Journal of Physics, Vol. 79, pp 699-702 (2005).

12. George Varughese, A. S. Kumar, A. V. Alex, J. Philip and L. Godfrey, Elastic properties of Potassium Lithium Hydrogen Sulphate crystal: An Ultrasonic Study, Ferroelectrics, Vol. 323, pp. 133-137, (2005)

13. Rajesh R, A Santhosh Kumar, Georgekutty Joseph and Godfrey Louis, Dielectric and Conductivity Studies of NiSeO4. 6H2O single crystal below room temperature , Proceedings of the DAE Solid State Physics Symposium (2005), Vol.50, pp. 745-746. (2005).

14. Godfrey Louis and A. Santhosh Kumar, The red rain phenomenon of Kerala and its possible extraterrestrial origin, – Astrophysics and Space Science Vol. 302, pp. 175-187 (2006).

    1. Godfrey Louis and A. Santhosh Kumar, Unusual autofluorescence of cultured red-rain cells, Proc. SPIE, Vol. 7097, 709712 (2008); DOI:10.1117/12.794041

    2. Kumar, A.S., Varughese, G., Iype, L., Rajesh, R., Joseph, G. and Louis, G., 2009, "Dielectric and Conductivity Anomoly Near 370 K in Lithium Hydoxylammonium Sulphate Single Crystal", In Dielectrics and Ferroelectrics: Modern Perspectives, R.N.P. Choudhary and A.K. Thakur (Eds.), Anamaya Publishers, New Delhi, India, In Press.

    3. G. Varughese, A. Santhosh Kumar, J. Philip, and G. Louis, Elastic constant measurements of super ionic LiKSO₄:Na single crystals , Cryst. Res. Technol. 44, 300-304 (2009)

    4. George Varughese, J. Philip and Godfrey Louis, Elastic Anomalies in LiK_0.9Na_0.1SO4 Single Crystal, Ferroelectrics, Vol. 377, pp. 55-62, (2008)

    5. George Varughese, A. Santhosh Kumar, J. Philip and Godfrey Louis, Elastic study of Potassium Sulphamate crystal using ultrasonic Pulse Echo Overlap technique, Solid State Communications Vol. 149 pp. 645-647 (2009) http://dx.doi.org/10.1016/j.ssc.2009.01.018

15. G. Joseph, A. Santhosh Kumar, L. Iype, R. Rajesh, and G. Louis, DC conductivity studies in K₃Na(SeO₄)₂ single crystals, Cryst. Res. Technol. 44, 759 (2009)

• 1. A. Santhosh Kumar & Godfrey Louis, An optical spectroscopic study correlating the yellow rain and cultured red rain microbes, Proceedings of SPIE ,

     1. Instruments and Methods for Astrobiology and Planetary Missions XII, Richard B. Hoover; Gilbert V. Levin; Alexei Y. Rozanov; Kurt D. Retherford, Editors, Volume: 7441, PP. 74410N-1 to 6 (2009). http://dx.doi.org/:10.1117/12.826780

updated link: http://dop.astrobiology.in/index.php/publications

Papers presented in conference, symposium etc.:

1. L. Godfrey, Simple automation circuit for crystal growth by Bridgman method, XIX National Seminar on Crystallography. M.G. University, Kottayam (December 1987)

2. L. Godfrey and J. Philip, Elastic nonlinearity parameters of tetragonal crystals, XIX National Seminar on Crystallography. M.G. University, Kottayam (December 1987)

3. L. Godfrey and J. Philip, A temperature controller for long duration constant temperature experiments, Symposium on current trends in Pure & Applied Physics, Cochin University of Science and Technology (November 1988)

4. L.Godfrey, V. Anil Kumar and Jacob Philip, A simple differential thermal analysis set-up for phase transition study, XXI National Seminar on Crystallography - Dec. 27-29 (1989) BARC, Bombay

5. L.Godfrey and Jacob Philip, Temperature variation of the elastic constants of LiHzS, Solid State Physics Symposium Dec. 21-24, (1991) B.H.U, Varanasi.

6. L. Godfrey and J. Philip, Elastic constants and Phase Transitions in Lithium Ammonium Sulphate, Solid State Physics Symposium, Dec. 27-31 (1993) BARC, Bombay,

7. L. Godfrey, Thesis presentation on - Ultrasonic study of the elastic constants and phase transitions in selected mixed sulphates, Solid State Physics Symposium, (DAE) Dec. 27-31 (1994) Jaipur.

8. L. Godfrey and J. Philip, Elastic constants of LiKSO₄ and absence of elastic anomaly at 333 K, Solid State Physics Symposium, (DAE) Dec. 27-31 (1994) Jaipur.

9. L. Godfrey and J. Philip, Ultrasonic attenuation anomaly in Lithium Hydrazinium Sulphate near 425 K, Solid State Physics Symposium, (DAE) December 27-31 (1995) Calcutta.

10. L. Godfrey and J. Philip, A Numerical Method For misorientation correction in Elastic constant measurements, National Symposium on Instrumentation, Sept. 25 - 28 (1996) Osmania University, Hyderabad, Organised by: Instrument Society of India.

11. A. Santhosh Kumar and L. Godfrey, Thermal conductivity and thermal diffusivity measurement of crystals using step heating method - A computer simulation study, XXVII National Seminar on Crystallography, September 24 26, (1997) Mahatma Gandhi University, Kottayam.

12. A. Santosh Kumar, Thressiamma Thomas and L. Godfrey, Electrical conductivity studies of Lithium Hydrazinium Sulphate single crystal, National seminar on Current Trends in Materials Science, 23, 24 March (2001) Mahatma Gandhi University, Kottayam.

13. Leesal Iype, C. M. Paul and L. Godfrey, Growth and studies of Hydrogen Selenates of Divalent metals - M(HSeO₄)₂ (M = Mg, Zn), National seminar on Current Trends in Materials Science, 23, 24 March (2001) Mahatma Gandhi University, Kottayam.

14. Geetha C. S. and L. Godfrey, Effect of growth of KTiO₂PO₄ crystal in different fluxes and different growth conditions, National seminar on Current Trends in Materials Science, 23, 24 March (2001) Mahatma Gandhi University, Kottayam.

15. Georgekutty Joseph and L. Godfrey, Digatally programmable Temperature controller for crystal growth, National seminar on Current Trends in Materials Science, 23, 24 March (2001) Mahatma Gandhi University, Kottayam.

16. George Varughese and L. Godfrey, Growth and microhardness study of Lithium sodium sulphate, National seminar on Current Trends in Materials Science, 23, 24 March (2001) Mahatma Gandhi University, Kottayam.

17. A. Santosh Kumar and L. Godfrey, Growth and electrical transport properties of Lithium Hydrazinium sulphate single crystal, XXXI National Seminar on Crystallography, 19-22 June ( 2001) Solid State Physics Division, BARC, Bombay.

18. George Varughese and L. Godfrey, Elastic properties of Li₂NaK(SO)₄ single crystal, XXXI National Seminar on Crystallography, 19-22 June ( 2001) Solid State Physics Division, BARC, Bombay.

19. Leesal Iype, C. M. Paul and L. Godfrey, Growth and optical absorption of hydrogen selenate of divalent metal Mg(HSeO₄)₂, XXXI National Seminar on Crystallography, 19-22 June ( 2001) Solid State Physics Division, BARC, Bombay.

20. George Varughese, A. Santhosh Kumar, Leesel Iype, A.V. Alex, Jacob Philip and L. Godfrey, Elastic properties of NLO Sulfamic acid crystal, DAE-BRNS National Laser Symposium 2002, Thiruvananthapuram, Nov.2002

21. Santhosh Kumar A and L.Godfrey, Growth and electrical conductivity studies of sulfamic acid single crystal, XII National Seminar on Ferroelectrics and Dielectrics, December 16-18, 2002, Materials Research Centre, Indian Institute of Science, Bangalore.

22. George Varughese, A. V. Alex, Jacob Philip and L. Godfrey, Elastic Properties of Potassium Sulfamate Single crystal - an Ultrasonic Study, XII National Seminar on Ferroelectrics and Dielectrics, December 16-18, 2002, Materials Research Centre, Indian Institute of Science, Bangalore.

23. Leesal Iype and L. Godfrey, Growth and Electrical conductivity Studies on Magnesium Selenate Hydrate (Mg SeO₄. 6H₂O) Single Crystal. XII National Seminar on Ferroelectrics and Dielectrics, December 16-18, 2002, Materials Research Centre, Indian Institute of Science, Bangalore.

24. A. Santhosh Kumar, and L. Godfrey Growth and Dielectric studies on Sulfamic Acid single crystal 4th ASIAN MEETING ON FERROELECTRICS(AMF-4) during 12-15 December 2003 at Indian Institute of Science, Bangalore, India.

25. George Varughese, A. Santhosh Kumar, Leesal Iype, A. V. Alex, Jacob Philip and L Godfrey Elastic properties of Potassium Lithium Hydrogen Sulphate crystal: An Ultrasonic Study 4th ASIAN MEETING ON FERROELECTRICS(AMF-4) during 12-15 December 2003 at Indian Institute of Science, Bangalore, India.

26. Leesal Iype, C M Paul and L Godfrey Growth and Dielectric studies of Magnesium selenate Hydrate single crystal 4th ASIAN MEETING ON FERROELECTRICS(AMF-4) during 12-15 December 2003 at Indian Institute of Science, Bangalore, India.

27. (list to be updated further)