The photochemical reaction between O⁻ ions and F centers
was investigated. The activation energy was determined by the
Arrhenius law to be 0.10 + 0.04 eV for temperature below 180°K.
The diffusion of alpha centers towards the oxide ion was eliminated
as the rate limiting step and the low trapping...
The oxidation of triethylamine by the two electron oxidant
thallium(III) chloride was studied and the results compared to those
when triethylamine is oxidized by copper(II) halides. This study
requires anhydrous conditions since in an aqueous system thallium(III)
chloride is extensively hydrolyzed and triethylamine causes
precipitation of thallium(III) oxide. Most of...
The analysis of 64 rock samples from Saudi Arabia and three
samples from the axial trough of the Red Sea has been done.
Instrumental neutron activation analysis (INAA) was the analytical
tool used for the analysis of at least 18 and as many as 24 elements
in these 67 rock...
The silicate phases of 11 pallasites were analyzed instrumentally
to determine the concentrations of some major, minor, and
trace elements. The silicate phases were found to contain about
98% olivine with 1 to 2% accessory minerals such as lawrencite,
schreibersite, troilite, chromite, and farringtonite present. The
trace element concentrations, except...
The yields from the oxidation of 4-methylpyrimidine with potassium permanganate were found to increase from 25 to 92 percent by the addition of small amount of potassium hydroxide to the reaction mixture. Pyrimidine-4-carboxylic acid decarboxylates in hot aqueous solution to yield pyrimidine and carbon dioxide. The rate is that decarboxylation...
The infrared absorption spectrum from 3200 cm⁻¹ to 4025
cm⁻¹ of thin crystals of ⁶LiOH (99%⁶Li.) is presented and compared
to the spectrum of [superscript]NLiOH (93%⁷Li). A shift in only one of the band
pairs supports the lattice combinations model and assists in making
assignments for the major features of...
A quadratic programming method was developed for the statistical
analysis of gas chromatographic data. The method was applied to
three types of flavor extracts, peppermint, hops and brewed tea. The
brewed tea data had to be abandoned because of the singularity of its
coveriance matrix. In all cases tried the...
The relative rates of hydrogen abstraction from a series of 13
arylmethanes by the trichloromethyl radical were determined at 70°.
The attacking radical was generated from bromotrichloromethane us
ing benzoyl peroxide as the initiator. The solvent was benzenebromotrichloromethane.
An excellent correlation, with a coefficient
of 0.977, was obtained when the...
Optimization of the galvanovoltammetric determination of dissolved
chlorine in a flowing stream was achieved through the use of
an analog computational device and improvements in the design of the
galvanovoltammetric cell and accompanying electronic circuitry. An
analysis system, applicable to industrial use over a range of flow
rates and dissolved...
Direct current conductivity measurements on KC1:O[superscript]= crystals
were used to determine an enthalpy of 0.42 ev for the dissociation for
anion-vacancy-oxide ion complex.
The entropy of dissociation was
found to be approximately -4x 10⁻⁴ev deg⁻¹. The intrinsic "activation" energy was found to be 1.91 ev as compared to 1.95 ev,...
A systematic study of the elution of magnesium and calcium from
Dowex 50 X 8 resin using α-hydroxyisobutyric acid (α-HIBA) at
various pH values and concentrations, indicated that the difference in
the equilibrium distribution coefficients of these two elements was
large enough for a good separation. This fact was applied...
A comparison was made of the d.c. conductivity of KCI:Pb²⁺
and KCl:PbO single crystals at temperatures greater than 325°C.
The energy of activation was 0.72 ev for all crystals. Lead concentration
was determined by chemical, optical and electrical methods. The
half band width of the UV absorption band at 273...