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Rigid rotor
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<p>In <a href="/facts/Rotordynamics/kzXd96r1">rotordynamics</a>, the rigid rotor is a mechanical model of <a href="/facts/Rotation/yChkz49x">rotating</a> systems. An arbitrary rigid rotor is a 3-dimensional <a href="/facts/Rigid_body/THezBlq2">rigid object</a>, such as a <a href="/facts/Spinning_top/u50YUBP6">top</a>. To orient such an object in space requires three angles, known as <a href="/facts/Euler_angles/pp30aAX5">Euler angles</a>. A special rigid rotor is the <i>linear rotor</i> requiring only two angles to describe, for example of a diatomic <a href="/facts/Molecule/N9ljSfFq">molecule</a>. More <a href="/facts/Rotational_spectroscopy/QakXReKL">general molecules</a> are 3-dimensional, such as water (asymmetric rotor), <a href="/facts/Ammonia/MtLtJFtz">ammonia</a> (symmetric rotor), or <a href="/facts/Methane/kBHneYnh">methane</a> (spherical rotor). </p>