Knowledge Bank

The analysis of the $\nu 6,\nu 7,\nu 8$ and $\nu 9$ bands of $H15NO3$ located at 646.9641, 578.4719, 743.6166 and $458.2917cm-1$ respectively has been carried out in the $400-800cm-1$ region using high resolution Fourier transform spectra recorded at Ottawa. Using the ground state energy levels calculated from the $v=0$ rotational constants of , it was possible to assign the A-type $\nu 6$ and $\nu 7$ bands and the C-type $\nu 8$ and $\nu 9$ bands of $H15NO3$ up to high J and $Ka$ rotational quantum numbers. The $v6=1,v7=1,v8=1$ and $v9=1$ experimental energy levels were then introduced in a least squares fit calculation and precise upper state Hamiltonian constants (band centers and rotational constants) were determined allowing one to reproduce the infrared data to within the experimental uncertainty.