The electric quadrupole moments of benzene and hexafluorobenzene

Elastic scattering of low-energy electrons by benzene

“…Because the lϭ0 partial wave occurs in the A 1g representation, one might ordinarily expect that the cross section vanish at zero energy for all other representations. 29 However, benzene has a substantial quadrupole moment, 30 and the resulting 1/r 3 potential will give rise to a nonzero scattering cross section at zero energy for lϾ0. [31][32][33] Indeed, using the measured quadrupole moment, 30 one can estimate the magnitude of the quadrupole-induced scattering within the Born approximation 32 as about 13ϫ10 Ϫ16 cm 2 , a value which appears roughly consistent with the summed results of Gianturco and Lucchese.…”

“…29 However, benzene has a substantial quadrupole moment, 30 and the resulting 1/r 3 potential will give rise to a nonzero scattering cross section at zero energy for lϾ0. [31][32][33] Indeed, using the measured quadrupole moment, 30 one can estimate the magnitude of the quadrupole-induced scattering within the Born approximation 32 as about 13ϫ10 Ϫ16 cm 2 , a value which appears roughly consistent with the summed results of Gianturco and Lucchese. However, it is not possible to say from the data presented in their paper whether the results of Gianturco and Lucchese are consistent with the quadrupole mechanism, which also predicts isotropic scattering and an energy-independent cross section.…”

19F-labeling of the adenine H2-site to study large RNAs by NMR spectroscopy

“…However, as was shown before, the 19 F-labeling of the aromatic system in RNA nucleobases can have two opposing effects. The base pairing stability is decreased (Broom et al 1979) whereas the base stacking is increased (Battaglia et al 1981). These two opposing effects can compensate each other so that the overall stability of the RNA is not impaired.…”

Host–Guest Interactions in ExBox4+

“…[30][31][32] To analyse the interaction type in detail we performed BEDA and also CDA. The BEDA data are provided in analysis is needed to get more precise result.…”