Ernest A. Jones

Isolation of cellulose from the cyst wall of a soil amoeba.

Abstract This paper describes the isolation and identification of a cyst-wall component of a soil amoeba, Acanthamoeba sp. The component is identified as cellulose on the basis of its chemical and physical properties. Cytochemical evidence for “masking” of the cellulose in vivo is presented and the significance of this masking effect is discussed.

Infrared and Raman Spectroscopy Studies of Light and Heavy Trifluoroacetic Acids

An infrared and Raman spectroscopic study of light and heavy trifluoroacetic acids shows that their vapors at room temperature are composed of a mixture of monomeric and associated molecules. The principal bands corresponding to vibrations of the COOH and COOD groups have been identified for both the monomeric and the associated molecules by means of a comparative study of the two acids (a) in the vapor state at different pressures, (b) in CCl4 solutions at various concentrations, and (c) in the liquid state. The monomeric carbonyl frequencies, influenced by the presence of the perfluoromethyl group, are the highest yet reported in the literature; this is true not only for CF3COOH (1826 cm−1, vapor), CF3COOD (1823 cm−1, vapor), but also for the ethyl ester, CF3COOC2H5 (1802 cm−1, vapor), the sodium salt, CF3COONa (1687 cm−1, solid), and the anhydride (CF3COO)2O (1884 cm−1 and 1818 cm−1, vapor). On the basis of a comparative study of the spectra of all these compounds, as well as of other perfluoromethyl c...

The Raman Spectrum, Structure, Force Constants, and Thermodynamic Properties of Bromine Pentafluoride

Using a Raman tube made of the plastic polychlorotrifluoroethylene, the Raman spectrum of bromine pentafluoride has been obtained. A method has been developed for making polarization measurements when Raman tubes constructed of this plastic are used. The spectrum of bromine pentafluoride has been correlated with a tetragonal pyramid configuration with symmetry C4v. Force constants were calculated using the Wilson FG Matrix method. The thermodynamic functions for BrF5 were calculated for temperatures ranging from 313.7°K to 1500°K, using the rigid rotator, harmonic oscillator approximation.

Far-infrared absorption of sulfur monobromide

Abstract The far-infrared absorption of sulfur monobromide has been investigated from 25–115 μ with prism spectrometers converted to grating instruments for far-infrared work. The frequencies of infrared-active fundamentals predicted by earlier workers from indirect methods have been confirmed by direct observation. Another infrared fundamental not previously reported in the infrared spectrum has been observed at 302 cm −1 . The observed spectrum has been correlated with a right-angle configuration of C 2 symmetry. Thermodynamic properties and force constants have been calculated.

Force Constants and Calculated Thermodynamic Properties of Nitrosyl Fluoride

The force constants for NOF were calculated using the Wilson FG Matrix method. Unique values could not be calculated, since the number of force constants exceeded the number of fundamental vibrations. However, upper and lower limits have been set for the force constants. The thermodynamic functions for NOF were calculated for temperatures ranging from 273.16°K to 1500°K, using the rigid rotator, harmonic oscillator approximation.

Pure-rotation band absorption intensities and dispersion of ammonia in the far infrared

Abstract The index of refraction of ammonia has been calculated in the spectral region 78–400 cm −1 from pure-rotation absorption data corresponding to transitions between the pure-rotation energy levels of the molecule for values of the total angular momentum quantum number from J = 4 to J = 15. The computed data reveal that the contribution of the rotation of the permanent electric dipole to the index of refraction is significant, and only experimental knowledge of the pure-rotation absorption intensities and trial numerical work will indicate when the electronic contribution alone is a valid approximation of the refractive index of a polar molecule in the far infrared.