MAGNETIC CIRCULAR DICHROISM OF CD3I IN THE VACUUM ULTRAVIOLET

摘要

The magnetic circular dichroism (MCD) of CD3I is reported in the 48 700-60 100 cm(-1) region. This region embraces the 5p-->6s manifold, much of the 5p-->6p manifold, and perhaps some members of the 5p-->5d Rydberg manifold of states. The results in the 5p-->6s manifold are confirmatory of the same work in CH3I [Scott er al., J. Chem. Phys. 68, 4678 (1978)]; some questions occur concerning the conferral of absorption intensity on the highly forbidden 5p-->6s[1] state of these molecules. The MCD of part of the 5p-->6p manifold of CD3I is also reported. Five possible 5p-->6p origins have been securely identified and a sixth has been tentatively assigned. Apart from one of these, that at 58 930 cm(-1), the other five origins assigned here match none of those found by MPI spectroscopy [Dobber, Buma, and de Lange, J. Chem. Phys. 99, 836 (1993)], suggesting a degree of complementarity of both data sets; Relative magnetic moments for all six observed states in the 5p-->6p region have been determined: the 58 930 cm(-1) origin has been assigned as a (1) Sigma(+) state, possibly an interloper from the 5d manifold, and the 59 630 cm(-1) origin has been assigned as a (1) Pi(1) state. The 5p-->6p manifold of CH,I is also discussed and assignments, which are largely vested in correlations of energies, absorption intensities, and MCD specifics with the corresponding excitations of CD3I, are given. (C) 1996 American Institute of Physics. [References: 16]