In this experiment Xe atoms are pumped to the excited states with an r.f. discharge and irradiated by the 3.99 µm Xe laser on the 5d[1/2] 0 0 →6p[1/2] 1 transition. Fluorescent light from the 6p[1/2] 1 level is observed to be modulated when the atoms are subjected to a low-frequency rotating field in perpendicular to the static field. The natural lifetime of the 6p[1/2] 1 level is obtained to be 56±3 ns. The 3.50 µm laser on the 5d[7/2] 0 3 →6p[5/2] 2 transition is also used. The light modulation signal of the fluorescence from the 6p[5/2] 2 level as a fuction of the magnetic field is a superposition of resonance curves of two different widths. The narrow component is a manifestation of atomic coherence of the 5d[7/2] 0 3 level which is transferred to the 6p[5/2] 2 level. The natural lifetime of the 5d[7/2] 0 3 level is obtained as 73±9 ns from the study of the 6p[5/2] 2 level.