Configuration I: Both particles rotate symmetrically on the same circle of diameter ρ with frequency ω. If e c ≠ 0, the frequency and the center of the orbit is fixed in the space. For identical particles (e > 0, m) for a given ρ, the frequency takes two values corresponding to different v; the center of the orbit rotates around the guiding center ρ 0 with frequency , see text.
Both particles rotate on concentric circles with relative phase π with angular frequency ω. If e c = 0, the frequency , if e c ≠ 0 the frequency .
Both particles rotate with the zero relative phase on concentric circles with angular frequency .
A dipole with fixed dipole moment moves with constant velocity.
Circular motion in the Born-Oppenheimer approximation (m 2 → ∞).
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