AbstractThe Raman spectra of 4‐fluoroanisole, 2,3,5,6‐tetrafluoro‐, pentafluoro‐, 2,3,6‐trichloro‐, 2,3,4‐trichloro‐ and 3,5‐dichloro‐anisole were recorded in the region 4000–10 cm−1and their infrared spectra as mulls were measured in the range 4000–200 cm−1. The Fourier transform far‐infrared spectra of the same samples in the region 600–20 cm−1were also obtained. A normal coordinate analysis was made for the in‐plane vibrations of these molecules using a 50‐parameter modified valence force field. The force constants were refined using an overlay least‐squares technique. Unambiguous vibrational assignments were made using the potentia