A diatomic molecule with the atomic masses MA and
MB can rotate around any axis through the center
of mass with the angular velocity
MB can rotate around any axis through the center
of mass with the angular velocity + (Fig. 9.42). Its
rotational energy is then
Erot = 12
I+2 = J2/(2I) . (9.82)
Here I = MAR2A +MBR2B
= MR2 where M = MAMB/
(MA+MB) is the moment of inertia of the molecule
with respect to the rotational axis and |J| = I+ is its
rotational angular momentum. Since the square of the
angular momentum
|J| 2 = J(J +1)h2
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[DOC]第五章:角动量、关于对称生
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质点系角动量与角动量守恒定律—质点系角动量定理
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can take only discrete values that are determined by
the rotational quantum number J, the rotational energies
of a molecule in its equilibrium position with an
internuclear distance Re are represented by a series of
R
S
RA RB
MA MB
A
B
Fig. 9.42. Diatomic molecule as a rigid rotor角动量定理编辑
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