The results of a zero-kinetic-energy pulsed-field ionization study on the a (1) Delta (v(+)=0) excited ionic state of SH+(SD+) obtained via two-photon excitation of the [a(1) Delta]3d pi(2) Phi (v’=0) Rydberg state and subsequent one-photon pulsed-field ionization are reported. Accurate ionization energies as well as rotational constants are obtained. A detailed comparison between the rotational branching ratios resulting from the pulsed-held ionization process and those of a direct ionization process is made. The results elucidate the dynamics of the high-n Rydberg states involved in pulsed-field ionization of SH (SD).