High-resolution analysis of the ν6, ν17, and ν21 bands of dimethyl ether

The v(6), v(17), and v(21) fundamental bands of dimethyl ether have been assigned and rotationally analyzed. The spectra used were recorded at 0.005 cm(-1) spectral resolution with a Fourier-transform spectrometer coupled to a Supersonic molecular beam leading to a rotational temperature of about 70 K. The v(6) and v(21) bands do not seem to be perturbed and the analysis of the rotational structure leads to band centers located at 933.906 6(9) and 1103.951(1) cm(-1), respectively, and to accurate rotational and centrifugal distortion constants. For the v(17) band at 2817.385(2) cm(-1), only the P and R branches could be assigned. (C) 2002 Elsevier Science (USA).