ON THE 3D RYDBERG STATES OF THE NO MOLECULE

We present a contribution to the study of the 3d Rydberg states of (NO)-N-14-O-16 based upon the analysis and treatment of infrared emission spectra of the H-2-SIGMA+, H-'2-PI --> D2-SIGMA+ (0-0) and (1-1) bands that we recorded at high resolution by Fourier transform spectroscopy. The 3d[sigma(H-2-SIGMA+), pi(H-'2-PI), delta(F2-DELTA)] complex representation is tested to determine the precision to which it is capable of reproducing the observed 3d-sigma, pi and also the 3d-delta term energy values (derived from the works of other authors). It appears that 3d-sigma pi-terms, at least in the complex upsilon = 0, can be approximated to within experimental accuracy in a large range of J values (standard deviation of the residuals corresponding to some 165 levels, 0.005cm-1). A similar precision is achieved for the 3d-delta(upsilon = 0) terms when the F2-DELTA-B'2-DELTA interaction is taken into account. Deperturbed energies and rotational constants are obtained for the 3d(upsilon = 0) and 3d(upsilon = 1) states. Values of the spin-orbit and rotational interaction parameters within the 3d complexes upsilon = 0 and upsilon = 1 are estimated. The possibility of evaluating the 1-uncoupling interaction between H-'2-PI and E2-SIGMA+ in the 3d4s supercomplex representation is examined.