The structure of liquid mercury has been studied with both CuKα and MoKα radiation using a theta–theta diffractometer with monochromator in the diffracted beam. Special attention has been paid to the temperature dependence of the liquid structure and the use of small droplets of about 5 μm diameter actually allowed measurements on supercooled liquid down to 60 K below the normal melting point. No significant variation in the first coordination number is observed over the temperature range studied, the change in the shape and the height of the first peak of the structure factor being probably due to some long range correlation increase when the temperature is lowered. A structure model based on a relaxed lattice is found to fit satisfactorily the experimental pair correlation function for liquid mercury.
It is shown how electron spin resonance spectroscopy with modulated radical initiation can be used to analyze by purely spectroscopic means the second-order termination kinetics of systems containing two different kinds of radicals, The technique is applied to species generated by photoreduction of acetone in tetraethoxy silane. The himolecular self-and cross reactions of (CH3CH20)3SiOcHCH3 (R1) and (CH&COH are found to be encountercontrolled processes. For the cross termination the often used relation klz = (4 klk2)"2 is verified experimentally.
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