Higher-order dipole-polarizabilities and intermolecular interaction potential of P-4 clusters obtained from collision-induced light scattering measurements

Collision-induced light scattering spectra of phosphorus vapour measured at 1000 K and density 132 mol m(-3) are used to deduce a Lennard-Jones type ( 15-6) intermolecular interaction potential U(R), the dipole-quadrupole pola rizability A, and dipole-octopole polarizability E of P-4 clusters. Using a recent experimental value of the dipole-dipole polarizability alpha(0) = 1 4.32 x 10(-30) m(3) at lambda = 514.5 nm, the experimentally recorded depol arized interaction-induced Raman spectra are best fitted with sigma= 4.4 x 10(-10) m epsilon/k = 700 K, A = (6 +/- 2) x 10(-40) m(4), and \E\ = (127 /- 17) x 10(-50) m(5). The analysis is hampered by the existence of the nu( 3)-nu(2) vibrational combination band at 98 cm(-1). (C) 1999 Elsevier Scien ce B.V. All rights reserved.