Molecular principle axes

The force F which has to be applied to a molecular lever requires accurate knowledge of its position x if reversible work is to be perfonned. Specifying the positional accuracy as Ax, the uncertainty principle gives the energy requirement as... 

PPG (at higher temperatures) behaves like a typical pseudoplastic non-Newtonian fluid. The activation energy of the viscosity in dependence of shear rate (284-2846 Hz) and Mn was detected using a capillary rheometer in the temperature range of 150-180°C at 3.0-5.5 kJ/mol (28,900 Da) and 12-13 kJ/mol (117,700 Da) [15]. The temperature-dependent viscosity for a PPG of 46 kDa between 70 and 170°G was also determined by DMA (torsion mode). A master curve was constructed using the time-temperature superposition principle [62] at a reference temperature of 150°G (Fig. 5) (Borchardt and Luinstra, unpublished data). A plateau for G was not observed for this molecular weight. The temperature-dependent shift factors ax were used to determine the Arrhenius activation energy of about 25 kJ/mol (Borchardt and Luinstra, unpublished data). 

The Stark effect of a rotational transition of a specific vibronic state will only yield the permanent electric dipole moment and the anisotropy of the electric polarizability (an - ax). In principle, both molecular... 

A field along the molecular symmetry axis would in principle mix a with a2, but in fact the shape of the ax orbital is such that very little overlap would result, and only a small g shift would be expected. A field perpendicular to the molecular plane would not mix the II state with any other state, and would give no g shift. Thus a II radical should display a large g shift along the 0-0 direction, a small g shift along the symmetry axis, and no g shift perpendicular to the nuclear plane. 

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