We propose a new measurement procedure to study the role of magnetic-dipole
contributions to the second-order nonlinearity in chiral materials. The pr
ocedure is based on the measurement of the ellipticity of the second-harmon
ic light generated in the chiral material. A better insight in the magnetic
-dipole nonlinearities of materials could eventually lead to the observatio
n of new phenomena in the field of photochemistry and photophysics. (C) 200
1 Published by Elsevier Science BN.