Acrylic acid (CH2CHCOOH): the rotational spectrum in the millimetre range up to 397 GHz

In order to facilitate its detection in astronomical observations, the measurement of the rotational spectrum of acrylic acid has been extended to 397 GHz using a free space cell at room temperature. 295 new lines were assigned to the s-cis conformer and 286 new lines to the s-trans conformer of acrylic acid. Using the determined experimental parameters, the predictions of the rotational transition frequencies up to 900 GHz and their intensities were obtained at temperatures of 100 and 200 K and at room temperature. Based on these predictions, a search of the most intense transitions of acrylic acid in star-forming regions was performed using published data from the HERSCHEL Science Archive. No lines were found but the possibility of observing rotational transitions of acrylic acid in astronomical objects is discussed.     

Pressure-Induced Charge Delocalization in Manganites Studied by Means of Infrared Spectroscopy

Infrared absorption spectra of the La 0.75 Ca 0.25 MnO 3 manganite have been collected over the spectral range 600-1100 cm m 1 along isobaric paths at P =0,2,4, and 7 GPa in the 240-320 K temperature range. The pressure dependence of the insulator-to-metal transition temperature T IM has been determined from the spectra analysis and the first PT phase diagram of a manganite in the high-pressure regime is presented and discussed.     

Coherent neutron scattering by light water (H2O) and a light-heavy water mixture (64 per cent H2O/36 per cent D2O)

Measurements have been made, with high statistical accuracy, of the differential scattering cross-section for 1·06 Å neutrons by light water and a special mixture of light and heavy water at 22°C. For light water, the structure in the scattering pattern is attributed mainly to coherent scattering; a structure factor has been obtained over a limited range of momentum transfer. For the chosen mixture, the protons and deuterons give no contribution to the coherent scattering and a structure factor has been obtained which corresponds very well to the oxygen-nucleus structure factor obtained from X-ray data. The results show the desirability of extending these high accuracy measurements using isotopic substitution methods as a means of obtaining the three partial structure factors for water. The method of isotopic mixtures is applicable to a wide range of proton containing liquids.     

Walrasian General Equilibrium and Nonlinear Dynamics

Investigations of the structural stability of the general equilibrium model show that within a nonlinear framework, the differential equation governing price adjustment requires two conditions: (a) The number of agents must be greater than or equal to the number of commodities; and (b) severe restrictions on the nature of preferences must be placed. These restrictions are the same as the restrictions on preferences that are required by Chipman and Moore (1980) in order to obtain an exact and an invariant measure of consumer surplus, which is the measure and standard of value in neoclassical economics. When the Chipman-Moore conditions are examined, it is clear that the required restrictions on preferences can also be understood as requiring the constancy of the marginal utility of money, either with respect to all prices (homothetic preferences), or with respect to income and all prices except the numeraire commodity (parallel preferences). The constancy of the marginal utility between the rich and the poor implies an unintended interpersonal comparison of utility. This makes the theory of value rather special, and has implications for much applied work such as benefit-cost analysis or other social decision-making, which requires a general theory of value. It is the utilitarian formulation of welfare, which by definition means that only utility information is taken into account, that leads to the restrictive theory of value. Consequently, avoiding utilitarianism requires an approach to social choice theory that takes other information about well-being into account in social decision-making.     

Study of the far-infrared and mm-wave conductivity of YBCO in the normal state

Il Nuovo Cimento D - An accurate determination of the optical conductivity σ(ν) of high-T c materials at low frequencies (ν<100 cm−1) is still an open problem. In the...     

Derivative transmission measurements of the temperature dependance of the Γ-Γ transition in the Ga0.73In0.27As0.59P0.41 compound

Derivative transmission measurements have been carried out on the LPE grown Ga_0.73In_0.27As_0.59P_0.41 quaternary alloy between 77 and 300 K. The resulting temperature dependence of the fundamental Γ-Γ transition is in accordance with the currently admitted behaviour in semi-conductors.     

Reactions of [MCl6]2− (M=Tc or Re) with salicylaldehyde. The molecular structure of tetraphenylphosphonium tetrachloro(salicylaldehydato) technetate (IV)

Summary The [PPh₄][TcCl₄(sal)] and [PPh₄][ReOCl₃(sal)] (sal=o-OC₆H₄CHO) complexes were synthesized from [PPh₄]₂[MCl₆] (M=Tc or Re) and salicylaldehyde. The complexes were characterized by elemental analysis, magnetic susceptibility and conductivity measurements and i.r. spectrometry. The structure of [PPh₄][TcCl₄(sal)] was determined by x-ray methods and consists of well-separated units of octahedral [TcCl₄(sal)]^– anions and tetrahedral [PPh₄]⁺ cations. The equatorial plane of the octahedron is formed by two Cl atoms and the chelated(2) sal group, with the resulting TcCl₂(sal) unit approximately planar. Selected values in the anion are as follows: Tc-Cl(mean) 2.34(1), Tc-O(1) 2.04(2) and Tc-O(2) 1.98(2), O(1)---O(2)(byte) 2.83 Å; O(1)-Tc-O(2) 89.3(0.7)^o.     

Future contributions to Journal of Chemical Crystallography

Future contributions to Journal of Chemical Crystallography     

Total cross sections of charged-current neutrino and antineutrino interactions on isoscalar nuclei

New measurements of the total crosssections of charged-current interactions of muonneutrinos and antineutrinos on isoscalar nuclei have been performed. Data were recorded in an exposure of the CHARM detector in an 160 GeV narrow-band beam. The antineutrino flux was determined from the measurements of the pion and kaon flux, and independently from the muon flux measured in the shield; the two methods are found to agree. The neutrino flux was determined from the muon flux ratio forv _μ and \(\bar v_\mu \) runs which was normalized to the antineutrino flux. The cross-section slopes thus determined are $$\begin{gathered} \sigma _T^{\bar v} /E = (0.335 \pm 0.004(stat) \hfill \\ \pm 0.010(syst)).10^{ - 38} cm^2 /(GeV \cdot nucleon) \hfill \\ \sigma _T^v /E = (0.686 \pm 0.002(stat) \hfill \\ \pm 0.020(syst)).10^{ - 38} cm^2 /(GeV \cdot nucleon) \hfill \\ \end{gathered} $$ The momentum sum of the quarks in the nucleon and the ratio of sea quark to total quark momentum are derived from the measurements.