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The generalized oscillator strengths (GOS) of discrete excitations np-nd,both dipole (L=1) and octupole (L=3) are studied, the latter for the firsttime. We demonstrate that although the relevant transitions in the same atomare closely located in energy, the dependence of their GOS on the momentumtransfer q squared, is remarkably different, so that the GOS corresponding toL=3 have at least one extra maximum as a function of q squared and dominateover those of the L=1, starting from about q=1.25$ atomic unit (a.u.). Thecalculations were performed in the one particle Hartree-Fock approximation andwith account of many-electron correlations via the Random Phase Approximationwith Exchange. The GOS are studied for values of q squared up to 30 a.u.Comment: 20 pages, 17 figures, 1 tabl

Octupole contributions to the generalized oscillator strengths of discrete dipole transitions in noble-gas atoms