Let me see if I got this straight... The hydrogen spectra consists of a couple of series - Lyman, Balmer, Paschen, Brackett, etc - which all corresponds to a certain energy transition - Lyman (n>1 -> n=1), Balmer (n>2 -> n=2).. and so on... correct ? And since n=1 is the ground state, a hydrogen atom in a low energy state will mainly emit lines in the Lyman series, right ? Isn't it strange that the highest energy photons are emitted at the lowest energy state ? Exactly what lines are emitted given a certain temperature (or energy state) ? I've been under the impression that all series are emitted seperately, i.e. all lines of a specific series (and only those lines) are emitted at a certain temperature. Is this true ? Or are all alfa-lines (in each series) emitted together, or perhaps just lines within a certain scope, e.g. 1000nm-2000nm ? If the entire lyman series is emitted at a lower energy state than say the alfa-line in Balmer, does this mean that the transition from say n=100 -> n=1 is more likely to happen than the transition from n=3 -> n=2 ? i.e. given a certain energy state, are all transitions in a lower series always more likely than any in a higher series ?