Isomerization of 1,2-diiodoethylene in a laser-induced chemical reaction of I2 + C2H2

A laser-induced chemical reaction of I₂ + C₂H₂ has been studied and the formation of cis and tians isomers of 1,2-diiodoethylene has been observed. The ratio of the two isomers of 1,2-diodoethylene changes markedly upon changing the laser wavelengths of excitation of the I₂ molecule     

The coulometric titration of bromate with cuprous copper

A coulometric procedure has been developed by which 18 to 240 μg quantities of bromate may be determined to within 0.3 μg. The bromate is allowed to react with bromide in an acid solution and electrolytically generated cuprous copper is used for the titration. A dual platinum electrode indicator system is used in an amperometric end-point procedure     

Endor frequencies of randomly oriented triplets by electron spin echo spectroscopy

ENDOR frequencies of randomly oriented triplets have been measured from the fast Fourier transform of electron spin echo envelope modulation. Important experimental conditions are low temperatures, high microwave power and long phase memory time in a proper form of solvent. The technique is exemplified by using diphenylmethylenes in rigid glasses, polycrystalline forms and single crystals of benzophenones.     

Synthesis of ring modified prostaglandins

The total syntheses of the ring modified prostaglandins 8–12, 16, 18, 20, and 22 are described.     

Thermal properties of xenon adsorbed on graphite

We report theoretical results for dynamical and thermodynamic properties of the bare graphite (0001) surface, and with a physisorbed monolayer of xenon. The surface vibrations of graphite are less pronounced than those in more isotropic crystals. The surface-excess specific heat of the bare surface peaks at 45 K, that of the xenon at 13.5 K.     

Fluoride in sea water: intercalibration study based on electrometric and spectrophotometric methods

Fluoride was shown to be a conservative constituent of sea water. Samples from the eastern tropical North Pacific, the Caribbean, the Labrador Basin, and the Reykjanes Ridge region indicated that the most probable $\text{F}\text{Cl}$ ratio in sea water is 6.71·10^-5 with an overall uncertainty of ±0.07·10^-5 based on 99% confidence limits of ±0.02·10^-5 and an allowance of ±0.05· 10^-5 for systematic error. Double-blind measurements from laboratories using electrometric and spectrophotometric methods agreed closely. Mean $\text{F}\text{Cl}$ ratios found were all within 0.7% of the most probable value.     

Characterization of surfaces by soft X-ray spectroscopy

Soft X-ray spectroscopy has important capabilities for investigating the surface region of metals and alloys. By calibrating the changes in the soft X-ray emission bands from both the metal and the oxygen, it is possible to determine the oxide thickness, the degree of oxidation, the element in the alloy with which the oxygen has combined, the relative amounts of alloying elements in the surface oxide, and the oxide state of a substrate metal that has a protective coating. For Ti-6Al-4V alloys there was an increase in surface oxygen after prebond treatment which was due to a change in the degree of oxidation rather than in oxide thickness, and the oxygen was combined with the titanium in the surface oxide. The oxygen K intensity distribution, from aluminum that was given a surface chromate treatment, showed that the oxygen is combined with the chromium. In Fe-Cr alloys there is an increase in the amount of chromium combined with oxygen relative to bulk chromium with decreasing chromium content. The oxide surface of steel with a 50 Å metal protective coating was reduced when the oxide of the protective metal coating had a heat formation greater than that of the iron oxide.