An atomic unit of length used in quantum mechanical calculations of electronic wavefunctions. It is symbolized by ao and is equivalent to the Bohr radius, the radius of the smallest orbit of the least energetic electron in a Bohr hydrogen atom. The bohr is equal to a/(4nR„), where a is the fine-structure constant, n is the ratio of the circumference of a circle to its diameter, and R„ is the Rydberg constant. The parameter a includes ft, as well as the electron's rest mass and elementary charge, and the permittivity of a vacuum. One bohr equals 5.29177249 X 10—11 meter (or, about 0.529 angstroms).

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