Energy states, atomic

These ideas were so revolutionary that they would not have been accepted except for the fact that Bohr was able to propose a way to calculate exactly the energy levels for the hydrogen atom. Within ten years Bohr s calculational methods were completely replaced by better techniques, but his postulate that only certain atomic energy states are possible has been repeatedly shown to be correct. 

Atomic Energy States, McGraw-Hill Book Co., New York (1932)... 

Fig. 3. Magnitudes and directions of the angular momentum vectors for an / = I. s = 5 electron in an atomic energy state...

Bohr Model of the Flydrogen Atom Energy States of the Flydrogen Atom Spectral Analysis... 

Atoms are discovered to consist of positive nuclei surroimded by systems of negative electrons, the various dispositions of which determine different series of atomic energy states. The rules governing the possible sequences of energy levels are ascertainable by the study of spectra and other means, and are derivable in general from the differential equation which summarizes all the other quantum laws. 

Atomic energy states used to obtain the electronic partition functions... 

Source DA McQuarrie, Statistical Mechanics, Harper Row, New York, 1976, and CE Moore, Atomic Energy States, Natl Bur Standards, Circ 1, 467 (1949). 

CE Moore. Atomic Energy States, Natl Bureau Standards Circ 1, 467 (1949). 

To explain why atomic energy states are quantized, scientists had to change the way they viewed the nature of the electron. 

Livingood, J.J. Shenstone, A.G. (in Bacher, R.F. Goudsmit, S., Atomic Energy States, McGraw-Hill, New York-London 1932, p. 387). 

Solution. In light atoms, a Russell-Saunders type of electron interaction usually take place. In Section 7.6 the method is described in detail. The atomic energy state, in this case, is characterized by a set of quantum numbers the total orbital quantum number L, total spin quantum number S and total internal quantum number J. Thus quantum number Jcan accept values from7 = L + Sup toL - IL — 5 I, changing on unit. A certain energy state of atom (spin-orbital interaction) corresponds to each value J, i.e., an energy sublevel appears. The number of sublevels or number of possible mutual orientations of vectors andL at is defined by the ratio 25 + 1 referred as multiplicity. At L < 5 the number of sublevels is defined by another ratio 2L + 1 (see Section 7.6.3). 

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