The rotational spectra of three isotopomers of the complex dimethyl ether–Xe (132Xe, 129Xe, 131Xe) have been measured by molecular beam Fourier transform microwave spectroscopy. An evenly spaced doubling of ca. 0.2 MHz, due to the internal rotation of the dimethyl ether subunit in the complex, has been observed for the lc-type transitions. The corresponding vibrational spacing, D01, has been determined to be 105(1) and 106(1) kHz for the 132Xe and 129Xe species, respectively. This datum has been useful to size the tunnelling barrier of Xe from above to below the COC plane. The nuclear quadrupole coupling constants of the 131Xe ðI ¼ 3=2Þ species have been precisely determined, vaa ¼ 4:57ð3Þ, vbb ¼ 2:93ð3Þ, and vcc ¼ 1:64ð3Þ MHz, respectively. These values indicate that the nuclear contributions to the field electric gradient at the Xe nucleus are smaller than the electronic ones.
CAMINATI W., MILLEMAGGI A., ALONSO J.L., LESARRI A., LOPEZ J.C., MATA S. (2004). Molecular beam Fourier transform microwave spectrum of the dimethylether-xenon complex: tunnelling splitting and 131Xe quadrupole coupling constants. CHEMICAL PHYSICS LETTERS, 392, 1-6 [10.1016/j.cplett.2004.05.038].
Molecular beam Fourier transform microwave spectrum of the dimethylether-xenon complex: tunnelling splitting and 131Xe quadrupole coupling constants
CAMINATI, WALTHER;MILLEMAGGI, ALDO;
2004
Abstract
The rotational spectra of three isotopomers of the complex dimethyl ether–Xe (132Xe, 129Xe, 131Xe) have been measured by molecular beam Fourier transform microwave spectroscopy. An evenly spaced doubling of ca. 0.2 MHz, due to the internal rotation of the dimethyl ether subunit in the complex, has been observed for the lc-type transitions. The corresponding vibrational spacing, D01, has been determined to be 105(1) and 106(1) kHz for the 132Xe and 129Xe species, respectively. This datum has been useful to size the tunnelling barrier of Xe from above to below the COC plane. The nuclear quadrupole coupling constants of the 131Xe ðI ¼ 3=2Þ species have been precisely determined, vaa ¼ 4:57ð3Þ, vbb ¼ 2:93ð3Þ, and vcc ¼ 1:64ð3Þ MHz, respectively. These values indicate that the nuclear contributions to the field electric gradient at the Xe nucleus are smaller than the electronic ones.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
