We present both some technical details of our newly built microwave Fourier
transform (MWFT) spectrometer and the analysis of the rotational spectra o
f isotopic species (C-13, D-3 fully deuterated) of t-butylchloride and t-bu
tylbromide. This study is motivated by the determination of the C-X (X = Cl
, Br) bond length. (C) 2000 Elsevier Science B.V. All rights reserved.