Bohr-Sommerfeld quantization rules

Equation (16) contains the information to relate the function n(r) to n(r) and it involves a factor, which changes when r equals r. There seems to be no convenient way to express this in a compact way. Its importance arises in connection with the derivation of the Bohr-Sommerfeld quantization rule. 

This expression is nothing but the Bohr-Sommerfeld quantization rule (see, e.g., Landau and Lifshitz [1981]). In the metastable potential of Figure 3.3 there are also imaginary-time periodic orbits satisfying (3.41) that develop between the turning points inside the classically forbidden region. It is these trajectories that are responsible for tunneling [Levit et... 

Tarnovskii, A.S. (1990). Bohr-Sommerfeld quantization rule and quantum mechanics, Uspekhi Fizicheskikh Nauk, 160, 155-156. [SW Phys.—Usp., 33, 86]. 

In order to understand the occurrence of dHvA oscillations one has to take into account the quantization of the electron motion. The Bohr-Sommerfeld quantization rule for an electron in a magnetic field is... 

It is noticed that in order for the 2x2 D-matrix in Eq. (25) to become diagonal, x(s) has to fulfill the well known Bohr-Sommerfeld quantization rule of the angular momentum, namely [24]... 

Biedenharn first explains the agreement of Sommerfeld s nonrelativistic quantum numbers with the exact answer. This agreement is by no means trivial, since usually Bohr-Sommerfeld quantization rules yield quantum number which are shifted by an unknown numerical constant from the exact ones. In the nonrelativistic Kepler problem there is, however, a quantum-mechanical operator corresponding to the classical eccentricity. This makes it possible to define the spherical orbits (i.e., those with vanishing eccentricity) in an unambiguous manner, which gives an absolute frame of reference for the Bohr-Sommerfeld quantum numbers. 

In this section, we prove that the non-adiabatic matiices have to be quantized ( similar to Bohr-Sommerfeld quantization of the angulai momentum) in order to yield a continous, uniquely defined, diabatic potential matrix W(i). In another way, the extended BO approximation will be applied only to those cases that fulfill these quantization rules. The ADT matrix A(s,so) transforms a given adiabatic potential matiix u(i) to a diabatic matiix W(s, so)... 

An obvious possible improvement of the Bohr model was to bring it better into line with Kepler s model of the solar sxstem, which placed the planets in elliptical, rather than circular, orbits. Sommerfeld managed to solve this problem by the introduction of two extra quantum numbers in addition to the principal quantum number (n) of the Bohr model, and the formulation of general quantization rules for periodic systems, which contained the Bohr conjecture as a special case. 

The Sommerfeld extension of the Bohr model was based on more general quantization rules and, although more successful at the time, is demonstrated to have introduced the red herring of tetrahedrally directed elliptic orbits, which still haunts most models of chemical bonding. 

In 1916. Arnold Sommerfeld generalized the Bohr quantization rule... 

Clearly Sommerfeld s methods were heuristic (Bohr quantization rules), out-dated by two revolutions (Heisenberg-Schrodinger nonrelativistic quantum mechanics and Dirac s relativistic quantum mechanics) and his methods obviously had no place at all for the electron spin, let alone the four-components of the Dirac electron. So Sommerfeld s correct answer could only be a lucky accident, a sort of cosmic joke at the expense of serious minded physicists. ... 

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