Abstract
The rotating-wave approximation (RWA) is discussed in the context of molecular collision processes occurring in the presence of laser radiation. While the basic concept of RWA (that antiresonant processes are insignificant when compared to resonant ones and hence can be ignored) is applicable to the molecular case as well as the atomic, the additional degrees of freedom render the application of RWA to molecular problems less transparent than to atomic problems. The application to molecular problems is formally discussed, and simple illustrative examples are presented. Difficulties associated with the application of RWA to more complex, and realistic, situations are remarked upon.
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