ABSTRACT.We have reinvestigated the laboratory spectrum for the methylformate HCOOCH 3 molecule involving both the ground and first excited torsional states.We have fitted within almost experimental accuracy a data set for this molecule consisting of 3496 v t = 0 and 774 v t = 1 microwave lines, using the so-called "rho axis method" (RAM) and a model extended to include perturbation terms through eighth order
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