The third-order optical nonlinearity of metal(dmit)(2) was investigated wit
h femtosecond optical Kerr effect at 830 nm wavelength. The nonresonant sec
ond-order hyperpolarizability for the didodecyldimethylammonium-Au(dmit)(2)
(2C12-Au) molecule was estimated to be as large as 2.2 x 10(-32) esu. (C)
1999 American Institute of Physics. [S0003-6951(99)03339-2].