THE SIMULATION OF AN UNUSUAL MAGNETIC CIRCULAR-DICHROISM SPECTRUM - THE 5P-]6S(1)SIGMA(-](3)PI(2) TRANSITION OF HI()(0))

The absorption and MCD (magnetic circular dichroism) spectra of the or igin band of the (1) Sigma(0)(+)-->(3) Pi(2) 5p-->6s Rydberg transitio n of HI are presented at the optimal resolution consonant with the gen eration of a reliable MCT) spectrum. The MCD spectrum is complicated a nd not readily interpretable. The absorption and MCD spectra have been simulated at three levels of resolution which involved calculation of the appropriate intensities (i) for each individual roelectronic tran sition, (ii) convolution of these in (i) with a shape function, and (i ii) convolution of those in (ii) with an apparatus function. It is sho wn that excellent agreement of experiment and theory occurs, and it is suggested that the majority of MCD spectra of the rovibronic transiti ons of gas phase molecules may be amenable to such analysis. (C) 1995 American Institute of Physics.