PHOTOEXCITATION OF ZN(CH3)2, CD(CH3)2, HG(CH3)2 COMPOUNDS IN THE 106-270 NM REGION

The photoabsorption cross sections and fluorescence excitation spectra of group IIb dimethylmetals were measured using synchrotron radiation at 106-270 nm. The observed absorption bands were accounted for in terms of Rydberg transitions. The fluorescence spectra of MCH3 (Ã 2E→X̃ 2A1) transitions were observed and the radiative lifetimes determined were 47 ± 2 and 62 ± 2 ns for M = Zn and Cd, respectively. The excited M(np 3P1 0) atoms were detected in the photolyses of dimethylcadmium and dimethylmercury, but not in dimethylzinc. The formations of the electronically excited MCH3 (Ã 2E) and M(np 3P 10) states are characteristic of the Rydberg excitations of the C-H in methyl and M-C bonding electrons, respectively. © 1990 American Institute of Physics.