Hydrogen bonding in solids correlation of spectroscopic and crystallographic data

A new model is proposed to describe the large recoverable extensions which can be observed with high polymers below their glass transition points. The model consists of a Hookean spring in series with an Eyring dashpot and rubber elasticity spring in parallel. Conventional stress-strain curves for cellulose nitrate and cellulose acetate sheet and PVC are compared with those predicted by the model. In this way many of the characteristic features of the stress-strain curves of plastics can be illustrated. Differences between the stress-strain curves of a number of polymers are discussed in terms of the model, and the tendency of a polymer to show necking is related to the ultimate network strain (limiting elongation) under the conditions of the test.

The use of a mathematical model to describe isothermal stress-strain curves in glassy thermoplastics

High-resolution spectroscopy of cluster ions.

Raman spectral studies of nucleic acids and related molecules—I Ribonucleic acid derivatives

A theory is proposed to describe the shape, in inert solutions, of hydrogen stretching ir bands of complexes with hydrogen bonds. The theory uses stochastic arguments and is related to general theories of ir band profiles of liquids. The cases of weak and medium strength hydrogen bond are treated separately. In the former case the band profile is, essentially, a broad asymmetrically distorted Gaussian produced by an anharmonic coupling between the high frequency AH stretching mode and the perturbed low frequency AH⋅⋅⋅B stretching mode. In the latter case the profile is, essentially, a very broad Gaussian intersected by a number of flat or deep, broad or narrow Evans‐type transmission windows. Here, the band shaping mechanisms are the anharmonic coupling between the AH stretching and different low frequency external motions and the Fermi resonance between states involving the AH stretching and some other internal modes. Spectral manifestations of hydrogen bonded liquids represent the most extreme case of vibrational broadening and the presence of the Evans holes is its characteristic feature.

Profiles of hydrogen stretching ir bands of molecules with hydrogen bonds: A stochastic theory. I. Weak and medium strength hydrogen bonds

The vibrational assignments and configuration of aniline, aniline-NHD and aniline-ND2

The vibrational spectra of phenol and phenol-OD

Further studies of unusual effects in the infrared spectra of certain molecules

Vibrational spectra and assignments for sixteen chlorobenzenes

A fiber-optic probe, useful for light scattering and luminescence measurements, which comprises at least one optical fiber for transmitting light into a sample and at least two optical fibers for collecting light from the sample. The probe may further comprise a shield surrounding the fibers and having an optical window at one end to protect the fibers from hostile environments. When used in conjunction with a laser as a light source, the probe is particularly suited for Raman spectroscopy.

J.C. Evans

Papers

The vibrational assignments and configuration of aniline, aniline-NHD and aniline-ND2

The vibrational spectra of phenol and phenol-OD

Further studies of unusual effects in the infrared spectra of certain molecules

Vibrational spectra and assignments for sixteen chlorobenzenes

Fiber-optic probe for sensitive Raman analysis