The excitation spectra of the 15V 31 344.9 band of the CS2 V B-1(2)<-- X (1)Sigma(g)(+) transition and the changes in these spectra with the application of a magnetic field of up to 12 kG have been measured with sub-Doppler resolution. The radiative lifetimes of rotationally resolved single lines and single Zeeman components were measured under collision-free conditions. All of the fluorescence decays were observed to be of a single exponential. Large Zeeman splittings were observed for many lines. The only symmetry allowed spin-orbit interaction is that of the (3)A(2)(B-2) component with the B-1(2) state. The (3)A(2)(B-2) component has no magnetic moment, but a magnetic moment is induced when it is mixed with the (3)A(2)(A(1),B-1) components. The mixing of the (3)A(2)(B-2) and (3)A(2)(A(1),B-1) components is facilitated by spin-rotation interaction and the Zeeman interaction. From analysis of the observed Zeeman splittings of the perturbed levels, the (3)A(2)(B-2) component was determined to lie 14 cm(-1) below the nearly degenerate (3)A(2)(A(1)) and (3)A(2)(B-1) components in the energy region where the 15V band is observed. Irregular energy shifts and splittings of rotational lines were observed, and these were attributed to (a) Coriolis interaction between the (VB2)-B-1(v(')(a(1));K=0JM) and V B-1(2)(v(b(2));K=1JM) levels and (b) resonant spin-orbit interaction between the rotational levels V B-1(2)(v(')(a(1));KJM) and R (3)A(2)(v(a(1));KJM). These interactions become appreciable when two levels lie close in energy. Large Zeeman splittings were observed in case (b). Many vibrational lines with irregular intensity and spacing were observed in each band. These were attributed to (c) Fermi resonance between the vibrational levels in the V B-1(2) state and (d) resonant spin-orbit interaction between vibrational levels in the V B-1(2) and R (3)A(2) states. In case (d), large Zeeman splittings were observed for a series of rotational lines in a vibrational band. The background lines were identified from observed Zeeman splittings as the transitions to levels of the R (3)A(2) state, which are induced by resonant spin-orbit interaction with the levels of the V B-1(2) state. The intensity of the excitation spectrum of the V B-1(2)<-- X(1)Sigma(g)(+) transition was observed to decrease as the magnetic field increases. This was attributed to a mixing of the (3)A(2) state with the V B-1(2) state and the resulting triplet-triplet emission, which was not detected in this experiment. It was possible to evaluate the lifetime of the radiative triplet-triplet emission via deperturbation analysis of the perturbed lines.