# FTS-LIF-III HYPERFINE MEASUREMENTS IN THE X, $1_{g}, O_{g}^{+}$ AND B STATES OF $I_{2}$ : A TEST OF THE ELECTRONIC MOLECULAR EIGENFUNCTIONS

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 Title: FTS-LIF-III HYPERFINE MEASUREMENTS IN THE X, $1_{g}, O_{g}^{+}$ AND B STATES OF $I_{2}$ : A TEST OF THE ELECTRONIC MOLECULAR EIGENFUNCTIONS Creators: Bacis, R.; Broyer, M.; Churassy, S.; Vergès, J.; Vigué, J. Issue Date: 1980 Publisher: Ohio State University Abstract: A high Resolution Fourier Transform Spectrometer and Laser induced Fluorescence spectrum (FTS-LIF) allow very high signal to noise ratios and then precise lineshape determination. From this it is possible to measure the hyperfine structure for the levels involved in the fluorescence lines : $B, l_{g}, O_{g}^{+}$ and X iodine states. From our measurements and some other results available In the literature we are able to predict the variation of the quadrupolar electric constant eQq in the B and X states for all vibrational levels. We also determine this parameter in some vibrational levels. of the $1_{g}$ and $O_{g}^{+}$ states. All these results are interpreted using ab-initio calculation with a LCAO (short internucleardistance) or a Separated Atom (near the dissociation limit) basis. The agreement between theoretical and experimental values is satisfactory. The theoretical eQq value depends drastically upon the basis set chosen for the electronic molecular state and then the eQq measurements may be considered as a probe of the electronic eigenfunction. For instance in the B and X state the separated atom eigenfunctions are a good approximation above an internuclear distance of about 4 or 4.5 {\AA}. Description: Author Institution: URI: http://hdl.handle.net/1811/11411 Other Identifiers: 1980-TG-13