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We report calculations of energy levels, radiative rates, collisionstrengths, and effective collision strengths for transitions among the lowest25 levels of the n <= 5 configurations of He~II. The general-purposerelativistic atomic structure package (GRASP) and Dirac atomic R-matrix code(DARC) are adopted for the calculations. Radiative rates, oscillator strengths,and line strengths are reported for all electric dipole (E1), magnetic dipole(M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions amongthe 25 levels. Furthermore, collision strengths and effective collisionstrengths are listed for all 300 transitions among the above 25 levels over awide energy (temperature) range up to 9 Ryd (10**5.4 K). Comparisons are madewith earlier available results and the accuracy of the data is assessed.

Radiative rates and electron impact excitation rates for transitions in He II