THE VAN DER WAAL'S INTERACTION OF PARTICLES.

Abstract

Recently Mrs. Vold (Proc. Ind. Acad. Sc., XLVJ, Scc. A, No. 2, pp. 152-166, Aug. 19571 has evaluated an expression for the interaction energy of two ellipsoidal particles situated in any mnnner relative to each other. She has assumed the law of interaction as the inversc sixth power of the distance and has obtained the expression For tho energy in terms of a series in ascending powers of (IiR). She has given explicitly the co-eflicienrs necessary to calculale the energy upto the first three terms of the series. In the present note the same problem has been reconsidered for the case in which each particle has three principal planes of symmetry. A series expression has been obtained as in Mrs. Vold's paper on the assumption that the law of interaction is the (2k)th power of (IIR), where k may be fractional. The resul1.k exprecssed in terms of various order moments of the particles. These moments have been tabulated for the case of ellipsoid.; and elliptic cylinders. No applications have been attempted as the npplications given in the paper cinder reference can easily be repeated for this also.