L. E. Lyons
Bio: L. E. Lyons is an academic researcher from University of Sydney. The author has contributed to research in topics: Conductance & Space charge. The author has an hindex of 5, co-authored 5 publications receiving 161 citations.
TL;DR: ABSOLUTE values of the electron affinity, E, of organic molecules have not been determined experimentally except in a few cases, and in most of these the uncertainty is several tenths of an electron volt or even more as discussed by the authors.
Abstract: ABSOLUTE values of the electron affinity, E, of organic molecules have not been determined experimentally except in a few cases1,2, and in most of these the uncertainty is several tenths of an electron volt or even more. Some theoretical values have also been calculated3. Since the electron affinity is a fundamental molecular property and also is4 of considerable importance to modern biology it is desirable that more and better values be found.
TL;DR: EVIDENCE1 is available to indicate that in the reduction of some aromatic molecules at the dropping mercury electrode one electron is added on to the neutral molecule.
Abstract: EVIDENCE1 is available to indicate that in the reduction of some aromatic molecules at the dropping mercury electrode one electron is added on to the neutral molecule.
TL;DR: It is suggested that certain central sympathetic suppressants act by donating electrons on the inside of the electric double layer of the central nervous system so that pharmacologically active substances should possess relatively low ionization potentials.
Abstract: ELECTRON-TRANSFER reactions between organic substances have often been implicated in various biological processes1–3. Recently, Karreman, Isenberg and Szent-Gyorgi4 have suggested that certain central sympathetic suppressants act by donating electrons on the inside of the electric double layer of the central nervous system. A consequence of this hypothesis would be that pharmacologically active substances should possess relatively low ionization potentials.
TL;DR: In this article, the following conclusions have arisen from work undertaken recently, namely, "the following conclusions arise from the work undertaken by the authors: 1) The following conclusions are true:
Abstract: THE following conclusions have arisen from work undertaken recently.
TL;DR: In this article, the fundamental aspects behind the structural design/realization of p- and n-channel semiconductors for organic field effect transistors (OFETs) are discussed.
Abstract: Organic molecules/polymers with a π-conjugated (hetero)aromatic backbone are capable of transporting charge and interact efficiently with light. Therefore, these systems can act as semiconductors in opto-electronic devices similar to inorganic materials. However, organic chemistry offers tools for tailoring materials' functional properties via modifications of the molecular/monomeric units, opening new possibilities for inexpensive device manufacturing. This article reviews the fundamental aspects behind the structural design/realization of p- (hole transporting) and n-channel (electron-transporting) semiconductors for organic field-effect transistors (OFETs). An introduction to OFET principles and history, as well as of the state-of-the-art organic semiconductor structure and performance of OFETs is provided.
TL;DR: In this paper, the electron affinities for benzene, pyridine, diazines, pyrazine, and s−triazine were determined from the present experiment (−1.15 eV and −0.62 eV for C5H5N).
Abstract: Electron transmission spectroscopy is used to study shape resonances (temporary negative ions) in benzene and some isolectronic N−heterocyclic molecules (pyridine, diazines, and s−triazine), in the energy range 0−6 eV. The lowest shape resonance in each of these molecules exhibits vibrational structure which is interpreted in all cases as the totally symmetric C−C stretch mode. The ground vibrational level of this lowest shape resonance is accessible by electron impact only in benzene and pyridine. Thus, their electron affinities can be determined from the present experiment (−1.15 eV for C6D6 and −0.62 eV for C5H5N). Only excited vibrational levels are accessible in the diazines and s−triazine, indicating that the electron affinities for these molecules have positive values. For benzene, pyridine, and some other aromatic hydrocarbons, we compare the electron affinities established in the gas phase with the polarographic potentials established in the liquid phase and we find a linear relationship. Using this correlation in conjunction with the measured values of the polarographic potentials, we estimate the electron affinities for pyridazine (0.25 eV), pyrimidine (0 eV), pyrazine (0.40 eV) and s−triazine (0.45 eV).
TL;DR: This chapter extends the idea of membrane stabilization to many types of cell membranes and subcellular membranes rather than confine the term just to the neurolemma and examines some of the physicochemical factors that may be important in determining the degree of membranes stabilization.
Abstract: Publisher Summary Anesthesia or stabilization of the nerve membrane is caused by alcohols, steroids, local anesthetics, phenothiazine tranquilizers, antihistamines, and various detergents. This chapter extends the idea of membrane stabilization to many types of cell membranes and subcellular membranes rather than confine the term just to the neurolemma. It also examines some of the physicochemical factors that may be important in determining the degree of membrane stabilization and presents a comparison of the many types of in vitro effects of membrane stabilizers along with a juxtaposition of the in vitro effects of local anesthetics and the phenothiazine tranquilizers on membrane-bound organelles. There is an extremely close analogy, both qualitative and quantitative, between neuron stabilization and erythrocyte stabilization against hypotonic hemolysis. A definite correlation exists between the anesthetic potency of steroids and the erythrocyte stabilization by a very diverse group of steroid compounds over a 100-fold range of concentrations. A second analogous action of stabilizers on nerve and nonneural membranes is to be found in their mode of toxicity at high concentrations. At high concentrations the majority if not all the neuron stabilizers cause a depolarization of the neurolemma; this is presumably related to the fact that practically all these compounds are surface-active and cause membrane emulsification at high drug concentration.
TL;DR: In this article, the scintillation counting behavior of a group of fifty-five pure crystalline organic compounds has been extensively studied with the goal of developing a better understanding of the Scintillation process and of scintillator behavior.
Abstract: The scintillation counting behavior of a group of fifty‐five pure crystalline organic compounds has been extensively studied. The data obtained have been analyzed with the goal of developing a better understanding of the scintillation process and of scintillator behavior.The materials were carefully purified, and massive crystals were grown. Relative scintillation average‐pulse‐height efficiencies at 30°C and —70°C for cobalt‐60 gamma‐ray excitation, gamma‐ray excited scintillation decay times, and 2537 A ultraviolet‐excited reflection and transmission photofluorescence spectra have been determined. A few solutions were also studied for comparison purposes. The purification and properties of the different materials are discussed in detail.The experimental data have been analyzed on the basis of Birks' photon cascade theory of the scintillation process. The ratio of the scintillation efficiency to the integrated photofluorescence intensity is shown to be a measure of Birks' primary photon production effici...