Abstract
We present the results of a numerical study of the invariant amplitudes of 1s-ns and 1s-nd two-photon transitions in hydrogenlike atoms in the nonrelativistic dipole approximation, based on compact analytic formulas. We report also results valid in the limit n\ensuremath{\rightarrow}\ensuremath{\infty}. The 1s-nd transitions with ng6 are studied for the first time. For other particular cases our numerical results are in agreement with previous calculations in the literature. The investigated energy region of the two-photon spectrum is extended. The position of the transparencies in the second half of the spectrum is found to be almost n independent.
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