[en] The Hanle effect was studied on the xenon 6p01 level by using a xenon laser at 3.99 μm (5d00-6p01) and fluorescences of 979.9 nm (6p01-6s12) and 1083.8 nm (6p01-6s11) transitions. In addition to the intensity variation due to the Hanle signal and Doppler profile, a peculiar signal was observed which had a width of about twenty times the Hanle width of the 6p01 level. This signal is found to be independent of the coherence among the Zeeman sublevels of the 6p01 level. (auth.)