Hi there. I'm new to this board so please excuse if this is misplaced, there seems to be too many places to choose from. While browsing my computer I found a little program I wrote when doing year 12 physics that was based on the textbook material about ionization energies. It recurssively calculates possible 'electron jumps' between energy levels and approximately displays the visible portion of the resulting photons. You can download it http://www.heraldsofdeath.com/geargod/downloads/freq.exe [Broken]. It will ask for a number of electrons and for each one, the ionization energy required. It will then ask the recurssion depth, think of this as the 'temperature' to which the 'sample' is heated. The program has no trouble calculating hydrogen and several other atoms if I remember right, but for other atoms the output is very different from lab results. Could someone explain to me why this is the case? I'm afraid that I have not touched physics since then and if anything, got stupider over the time.