(2+1) REMPI spectrum of Rydberg states of S atoms in the 243-263 nm region

About 50 spectral lines due to the (2 +1) resonance-enhanced multiphoton io nization (REMPI) of atomic sulfur, generated in the sequential multiphoton dissociation of SO2 at probing wavelengths, in the 243-263 nm region has be en observed. Besides most of the lines which are due to the two-photon tran sitions from the ground states P-3(2,1,0) to the Rydberg states P-3, D-3, F -3 until n = 10 of S atom, several new lines including the spin forbbiden t ransition P-1(0), S-5(0) <-- P-3 and the two-photon transitions from the ex cited state D-1(2) to the Rydberg states np(1,3)D, F-1,F-3 are observed. In tensities of some lines have been calculated and compared with the experime ntal results.