S-T conversion induced by magnetic field in H2CS excited to the single rotational levels of the A-bar1A2(00) vibronic state

Fluorescence decay of the rotationally cooled thioformaldehyde (H2CS) excited to the different single rotational levels of the A-bar1A2(00) state was measured as a function of an external magnetic field. On excitation to this level, the dynamics can be described using the intermediate-molecule limit. The fast component of the fluorescence decay was not resolved (time resolution of the used experimental setup is not enough), while decay of the slow component was measured, and it was found that lifetime of this component depends on the magnetic field strength. The results obtained were explained by the indirect (electronic- and nuclear-spin-decoupling) mechanism