Effective collision strengths with inclusion of resonance for hyperfine-structure transitions in H- and Li-like ions

摘要: Calculations are made of the resonance contribution to electron-impact excitation H-like 13C and Li-like 23Na, 25Mg, 27Al 29Si upper hyperfine levels that produce millimetre (mm) lines likely astrophysical interest. The is found be very important for these ions, considerably more than 57Fe considered previously. However, resonances rather unimportant 13C. effect radiative decay on insignificant in all present calculations.