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The dielectric loss of seven aromatic ethers (anisole, 1,2- and 1.4-dimethoxybenzene, 4-methylanisole, 4-chloranisole, 1- and 2-naphtholmethylether) and of three aliphatic ethers has been measured at 20 °C in very dilute solutions of aliphatic solvents (n-heptene, cyclohexene and decalin). The microwave frequencies used cover 2 to 70 GHz, in the far infrared region (FIR), wave numbers 40 to 300 cm -1  have been available. All microwave spectra of loss factor ε´´ are analysed in terms of two or three absorption areas by fitting dispersion steps and Debye relaxation times and employing non-zero correlation times of angular momentum. On the other hand, Lorentz curves are fitted to the FIR absorption spectra of α (ν̄). The dispersion step got from the dielectric loss spectra now measured includes all orientation processes of the permanent molecular dipole, and it agrees with the value obtained by the so called optical method. There are about 10% of the step which belong to the FIR absorption. In aromatic ethers the methoxy group is partly hindered to rotate, in the naphthol compounds to even a higher degree. This fact is discussed concerning mesomerism and steric hindrance. All studied methyl ethers show a characteristic resonance near 100 cm -1 , which is suggested to be due to a rotational oscillation of the group.

Molekülinterne Dipolorientierung und dielektrische Absorption in verdünnter Lösung bei Mikro- und Submillimeterwellen. III. Methyläther