Another problem that arose in early studies of atoms and molecules resulted from the study of the photons emitted from atoms and ions that had been heated or otherwise excited(e.g, by electric discharge ). It was found that each kind of atom(i.e, H or C or O)emitted photons whose frequencies v were of very characteristic values. An example of such emission spectra is shown in Fig. 1. 2 for hydrogen atoms 2/nm TotaH Aimer Lyman A即ay Brackett Figure 1. 2. Emission spectrum of atomic hydrogen with some lines repeated below to illustrate the series to which they belong In the top panel, we see all of the lines emitted with their wave lengths indicated in nano meters.The other panels show how these lines have been analyzed(by scientists whose names are associated) into patterns that relate to the specific energy levels between which transitions occur to emit the corresponding photons5 Another problem that arose in early studies of atoms and molecules resulted from the study of the photons emitted from atoms and ions that had been heated or otherwise excited (e.g., by electric discharge). It was found that each kind of atom (i.e., H or C or O) emitted photons whose frequencies n were of very characteristic values. An example of such emission spectra is shown in Fig. 1.2 for hydrogen atoms. Figure 1.2. Emission spectrum of atomic hydrogen with some lines repeated below to illustrate the series to which they belong. In the top panel, we see all of the lines emitted with their wave lengths indicated in nano￾meters. The other panels show how these lines have been analyzed (by scientists whose names are associated) into patterns that relate to the specific energy levels between which transitions occur to emit the corresponding photons