The lifetimes of electronic ground state, vibrationally excited aniline-noble gas complexes are measured in pump-probe experiments. When exciting the I-0(2)-mode (422 cm(-1)) of aniline-X (X = Ne, At), lifetimes are measured to be 36 +/- 3 ns for the neon complex and 151 +/- 34 ns for the argon complex. Upon deuteration of the amino group, the frequency of this mode shifts to 335 cm(-1) and the lifetimes increase dramatically. Ring deuteration of aniline shortens the lifetime of the vibrationally excited aniline-argon complex to 29 +/- 3 ns. Comparison of these results with statistical theory shows non-statistical behavior which is attributed to slow Internal Vibrational Redistribution (IVR). (C) 2002 Elsevier Science B.V. All rights reserved.