What does it mean anharmonic frequency ?

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What does it mean "anharmonic frequency"?

Hi,

in quantum mechanic (in spectroscopy) people use such terms as "anharmonic frequency"? Does anybody know the definition of that term?
 
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noi_tseuq said:
Hi,

in quantum mechanic (in spectroscopy) people use such terms as "anharmonic frequency"? Does anybody know the definition of that term?
Unharmonic means not sinusoidal.
 

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