The talk will touch upon the possibilities to perform precision spectroscopy of atomic quantum levels without detecting the emission of photons or electrons. One prominant example is determination of the electron binding energy by high precision mass measurements in Penning traps. Another very different way to the access atomic transition energy is by excitation of bound electrons through resonant coherent excitation of fast ions in crystals, with the following enhanced loss of the excited electrons. This can seen as a kind of collision spectroscopy. Some more examples in that category will be discussed: These are precision measurements of the Q-value in electron capture by, or excitation of, highly charged ions by COLTRIMS. And finally, a very promising tool is the detection of resonances in electron scattering by dielectronic recombination.