Sivaraj Ramaseshan, Indian physicist (Calcutta
10 December 1923 – Bangalore 29 December 2003) Relative of Nobel prize winners being nephew of
physicist C.V. Raman and cousin of astrophysicist Subramanyan Chandrasekhar Performed studies on optics, magnetooptics,
solid state physics and crystallography Authored 178 papers With K. Venkatesanm & N.V. Mani proposed a
novel method for determining the phase angles without ambiguity in
non-centro-symmetric crystals that formed the basis of the Multiple Anomalous
Dispersion (MAD) in 1957 First to solve the structure of centrosymmetric
crystals Established the multiwave anomalous x-ray
scattering method for the determination of phases of reflection Proposed the use of anomalous neutron
scattering for resolving very large structures Showed theoretically that anomalous scattering
of neutrons can yield information on the polarization vectors of lattice waves
and described detailed experimental procedures for their determination in
centro- and non-centrosymmetric crystals Recognized the possibility of using anomalous
scattering of x-rays coupled with multiple wavelength method to obtain the
structure of amorphous or liquid binary systems Showed that the resistivity anomaly in liquid
caesium is due to anomalous electron scattering during the Fermi 6s-5d electron
collapse Formulated and verified laws governing
cleavages in crystals Discovered icosahedral coordination in ionic
solids Developed new techniques for low-temperature
crystallography Predicted pressure-induced optical activity Predicted and verified the existence of
pressure-induced liquid crystallinity Determined the critical point in solid-solid
isostructural transformation of SmS Developed
instrumentation for high and low temperature x-ray crystallography LINKS |
Alphabetical List > R >
Since 2011 by André Trombeta