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The definition of [[rigid rotor]] stems from classical mechanics. The concept is applied in [[molecular physics]], especially in [[microwav In classical mechanics, as well as in quantum mechanics, the kinetic energy of rotation of a rigid

* {{cite book | author=Goldstein, Herbert | title=Classical Mechanics | publisher=Addison Wesley | year=2002 | id=ISBN 0-201-65702-3}}

According to classical mechanics a physical system behaves deterministic,

In [[classical mechanics]], the '''momentum''' of a point particle is the [[mass]] ''m'' of the part ...um is expressed with respect to a reference frame. In most applications of classical mechanics this frame is fixed to the earth (a "laboratory frame"). [[Einstein]]'s th

...limit of quantum mechanics, although this has not been proven in general. Classical mechanics can be divided into two parts:

...of [[fluid]]s, i.e., [[liquid]]s and [[gas]]es. It is an adaptation of [[Classical mechanics#Newton's laws of motion|Newton's laws of motion]] to a medium that is treat ...ne of the great unsolved mysteries of fluid dynamics and by extension of [[classical mechanics]]. While many properties of turbulent flows are understood, a deductive th

In classical mechanics the potential energy ''V'' can never surpass the total energy ''E'', becaus

...]], it does ''not'' have [[rest mass]].<ref>This is unexpected, because in classical mechanics linear momentum of a particle is proportional to the mass of the particle.<

...laws are perhaps the most powerful tools of analysis in [[physics]] and [[classical mechanics]].<ref>{{cite book|author=Gerald J. Holton and Stephen G. Brush|title=Physi

...reference]] in which the laws of physics take on their simplest form. In [[Classical mechanics#Newton's laws of motion|Newtonian mechanics]], and in [[special relativity] ...e laws of mechanics take the same form in inertial frames, specifically, [[Classical mechanics#Newton's laws of motion|Newton's laws of motion]] are the same for all obse

* V. I. Arnold, ''Mathematical Methods of Classical Mechanics''. Springer-Verlag, Berlin, 1989. ISBN 978-0-387-96890-2.

...lassical mechanics timeline.PNG|right|325px|Timeline for key scientists in classical mechanics}} ...Newtonian mechanics is therefore often referred to as ''nonrelativistic'' classical mechanics,<ref name=Stehle/> and likewise, relativity as ''relativistic'' mechanics.

In classical mechanics the angular momentum of a body is a vector that can have ''any'' length and

...cal]] approximation ''semiclassical molecular dynamics'', and within the [[classical mechanics]] framework ''[[molecular dynamics]] (MD)''. Statistical approaches, using

...ed for [[Isaac Newton]] (1643 - 1727), who developed the laws of motion in classical mechanics.

===Classical mechanics===

In [[classical mechanics]] and [[quantum mechanics]], a '''rigid rotor''' is a 3-dimensional rigid

...le="vertical-align: text-top;"><math>\mathcal{A}</math></font> (defined in classical mechanics or electromagnetism) has a quantum mechanical counterpart, an observable (H ...er, this mode of action would be, in general, ambiguous. For instance, in classical mechanics the [[inner product]] '''p'''&sdot;'''r''' is equal to '''r'''&sdot;'''p'''

...for excitations of vibrational modes by absorption of (infrared) photons. Classical mechanics cannot treat these quantized excitations.

...[first quantization|first quantized]] [[quantum theory]] that supersedes [[classical mechanics]] at the [[atom]]ic and [[subatomic particle|subatomic]] levels. It is a fu Quantum mechanics is a more fundamental theory than [[Classical mechanics|Newtonian mechanics]] and classical [[electromagnetism]], in that it provid