MEASUREMENT OF STATIC POLARIZABILITIES ON S-TETRAZINE

Laser Stark spectroscopy has been performed on s-tetrazine molecules in a collimated, seeded supersonic beam. The Stark splittings and shifts of the r(R)(0)00 and the p(P)(1)10 lines in the vibrationless A 1B3u <-- X 1A(g) transition could be measured in a static homogeneous electric field. The determined polarizability anisotropy of the A 1B3u state is 1/2(P'(aa) + P'(bb)) - P'(cc) = 6.7(2) angstrom 3, and of the X 1A(g) ground state 1/2(P"(aa) + P"(bb)) - P"(cc) = 0.8(2) angstrom 3. The difference in the average polarizability P = 1/3(P(aa) + P(bb)) + P(cc)) between these two states was found to be DELTA-P = P' - P" = 1.4(2) angstrom 3.