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I am trying to solve an-harmonic oscillator (with $x^4$ terms) and need theoretical data to compare with my numerical data. I have searched research papers on anharmonic oscillators and few spectroscopy books like Banwell's.
Can anyone recommend books or papers with theoretical data on an-harmonic oscillators?
$\begingroup$It is good idea to use several different methods and compare results. You can get decent estimates using variational methods and perturbation theory.$\endgroup$