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Context.  The spectra of four low-lying vibrational states of both  anti  and  gauche  conformers of  normal -propyl cyanide were previously measured and analyzed in two spectral windows between 36 and 127 GHz. All states were then identified in a spectral line survey called Exploring Molecular Complexity with ALMA (EMoCA) toward Sagittarius B2(N) between 84.1 and 114.4 GHz with the Atacama Large Millimeter/submillimeter Array (ALMA) in its Cycles 0 and 1.   Aims.  We wanted to extend the measurements and analysis up to 506 GHz to provide accurate predictions over a much wider range of frequencies, quantum numbers and energies.   Methods.  We carried out measurements in two additional frequency windows up to 506 GHz.   Results.  For the  gauche  conformer, a large number of both  a - and  b -type transitions were identified. For the  anti  conformer, transitions were predominantly, but not exclusively,  a -type. We hence improved molecular parameters for the ground states of both  anti - and  gauche - n -propyl cyanide and for excited vibrational states of the  gauche  conformer ( v  30  = 1,  v  29  = 1,  v  30  = 2,  v  28  = 1) and  anti  conformer ( v  30  = 1,  v  18  = 1,  v  30  = 2,  v  29  = 1) with high order coupling parameters determined between  v  18  = 1 and  v  30  = 2. Parameters are published for the first time for  v  18  =  v  30  = 1 of the  anti  conformer and for  v  29  =  v  30  = 1 of the  gauche  conformer.   Conclusions.  In total 15385 lines have been incorporated in the fits and should allow good predictions for unperturbed lines over the whole operating range of radio-telescopes. Evidence is found for vibrational coupling for some levels above 380 GHz. The coupling between  v  18  = 1 and  v  30  = 2 of the  anti  conformer has been well characterized. An additional list of 740 lines showing potential but as yet unidentified coupling has been provided for astrophysical identification.

Rotational rest frequencies of the low lying vibrational states of n-propyl cyanide from extensive laboratory measurements up to 506 GHz