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Microwave Spectra of Molecules of Astrophysical Interest

By: Donald R. Johnson

Technical Reference Publication

Introduction: This paper represents the first in a proposed series of critical reviews of the microwave spectra of molecules of astrophysical interest. It has been prepared in response to the rapidly growing needs in the field of molecular radio astronomy for reliable laboratory spectra of selected molecules. The best available data lave been gathered for each molecule and subjected o an extensive statistical analysis. This analysis protides the molecular constants for t...

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Microwave Spectra of Molecules of Astrophysical Interest

By: Donald R. Johnson

Technical Reference Publication

Introduction: This paper represents the first in a proposed series of critical reviews of the microwave spectra of molecules of astrophysical interest. It has been prepared in response to the rapidly growing needs in the field of molecular radio astronomy for reliable laboratory spectra of selected molecules. The best available data lave been gathered for each molecule and subjected o an extensive statistical analysis. This analysis protides the molecular constants for t...

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Evaluated Activity and Osmotic Coefficients for Aqueous Solutions ...

By: Robert N. Goldberg

Technical Reference Publication

Introduction: This paper presents a continuation of work at the National Bureau of Standards on the evaluation of activity and osmotic coefficients in aqueous solutions. Previously, evaluations have been made for the uni-univalent electrolytes calcium chloride 123, the alkaline earth metal halides [3], and sulfuric acid [4]. The evaluation procedures have been described [2,3,5] in substantial detail and a bibliography [6] giving the results of a search of the scientific ...

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Heat Capacity and Other Thermodynamic Properties of Linear

By: Umesh Gaur

Technical Reference Publication

Introduction: This is the eighth paper in a series of discussions on the heat capacity of linear macromolecules. In the earlier papers, the heat capacity of selenium, polyethylene, polypropylene, polystyrene and various types of polyoxides, acrylic polymers, and other carbon backbone polymers have been analyzed. In this paper polyesters and polyamides for which heat capacity data are available have been analyzed. These are polyglywlide, poly(e-caprolactone), poly(ethylen...

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Transport Properties of Liquid and Gaseous D20 Over a Wide Range

By: N. Matsunaga

Technical Reference Publication

Introduction: Since heavy water is one of the most important substances in nuclear power technology, information on the thermophysical properties of heavy water over wide ranges of temperature and pressure is needed for successful design. After the publication of the comprehensive compilation of the properties of heavy water in 1964, no comprehensive critical review of the transport properties was published for many years. Having collected large body of experimental data...

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The Solubility of Nitrogen C1072And Air in Liquids

By: Rubin Battino

Technical Reference Publication

Introduction: In this review, we are concerned with the solubility of nitrogen and air in most liquids for which data are available and over all temperatures and pressures. The fluids considered include pure liquids, organic and inorganic solvents, mixtures, biological fluids, and miscellaneous fluids. We did not include molten salts, alloys, metals, glasses, and slags or polymeric materials. For the systems included, there is a considerable literature at elevated pressures.

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A Review and Evaluation of the Phase Equilibria, Liquid-Phase Heat...

By: A.J. Kidnay

Technical Reference Publication

Introduction: This paper is a continuation of previous on the review, evaluation, and correlation of phase equilibria and related data on industrially important binary systems of fluids. The first system considered was methane + ethane, the second was methane -I- propane and the present work is concerned with the nitrogen + methane system. These are three of the most important systems related to the natural gas industry.

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The Homogeneous Nucleation Limits of Liquids

By: C.T. Avedisian

Technical Reference Publication

Excerpt: Significance of the Limit of Superheat. The homogeneous nucleation limit, or limit of superheat, of a liquid represents the deepest possible penetration of a liquid in the domain of metastable states. At constant pressure and composition, it is the highest temperature below the critical point a liquid can sustain without undergoing a phase transition; at constant temperature, it is the lowest pressure. The practical significance of this limit resides in the cons...

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Triplet-Triplet Absorption Spectra of Organic Molecules

By: Ian Carmichael

Technical Reference Publication

Introduction: In 1971, as part of the classic volumes on organic molecular photophysics edited by the late J.B. Birks, Labhart and Heinzelmann contributed a review' which contained an extensive compilation of spectral data relevant to the absorption of light by the excited triplet state of organic molecules in condensed phases. The energies of absorption maxima in both fluid solution and in various glasses and solids were recorded together with the corresponding extincti...

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Computer Methods Applied to the Assessment of Thermochemical Data

By: S.P. Kirby

Technical Reference Publication

Introduction: This paper describes the development of computer techniques for storing and manipulating thermochemical data and corresponding textual material. The methods are illustrated by their application to the assessment of data on TiCf,(g). TiCI,(l), TiCI, (cr), and TiCl,(rr) for which recommended values for standard enthalpies of formation and entropies are given. Future papers will deal with the application of these methods to the full range of transition metal halide...

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Recommended Data on the Electron Impact Ionization of Atoms and Ions

By: M.A. Lennon

Technical Reference Publication

Introduction: Cross sections and rates for electron impact ionization of positive ions are needed for the development of realistic models for high-temperature plasmas and for interpretation of diagnostic observations in such plasmas. In an earlier paper (Bell et a[.') a set of recommended cross sections and rate coefficients for light atoms and ions was presented. The recommendations were based on a careful assessment of the best experimental and theoretical data availab...

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Thermal Conductivity of Nine Poiyatomic Gases at Low Density

By: F. J. Uribe

Technical Reference Publication

Introduction: Temperature-dependent dimensionless factor needed in the calculation of AzEqs. (A10) and (C6c) Planck constant, Table B1 Boltzmann constant, Table B1 mass of a molecule molecular weight Avogadro constant, Table B1 Prandtl number, Eq. (2) universal gas constant, Table B1 temperature reduced temperature, T / E short-range energy parameter of intermolecular exponential repulsion high-temperature scaling parameter, V, E Accurate correlations and predictions of ...

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The Viscosity and Thermal Conductivity of Pure Monatomic Gases+C2179

By: E. Bieh, J. Millat and E. Vogel

Technical Reference Publication

Introduction: The existence of a sophisticated kinetic theory for zero-density gases, in conjunction with the progress that has been made with respect to high-precision measurements of the transport properties of gases, has provided the basis for the development of extensive and accurate correlations and predictions for the viscosity and thermal conductivity of many simple gases and gas mixtures. In general, one can differentiate between so-called universal correlations ...

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Evaluation of Solubility Data Sf the System C02-H28 from 273 K to ...

By: Rosa Crovetto

Technical Reference Publication

Introduction: The solubility of C02 in H20 is of great importance in many different fields. At temperatures between 273 and 315 K it plays an essential role in biochemistry and biotechnology. At higher temperatures it becomes important to geo-chemistry, power plant water, chemistry, industrial steam water cycling, and engineering design. Also, a consistent set of evaluated data can be used as a test for predictions from nodes of aqueous solution...

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Improved Fits for the Vibrational and Rotational Constants of Many...

By: Russ R. Laher

Technical Reference Publication

Introduction: In predicting or analyzing the radiation from disturbed or heated air, one often must deal with transitions among excited states of nitrogen and oxygen. In the aurora, for example, energetic charged particles inelastically scatter in the upper atmosphere to produce a myriad of highly...

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The Solubility of Some Sparingly Soluble Salts of Zinc and Cadmium

By: H. Lawrence Clever

Technical Reference Publication

Introduction: Argon plasmas are widely used for fundamental plasma spectroscopy studies as well as for numerous applications involving technical plasmas, such as gas lasers and spectrochemical investigations with inductively coupled plasmas (ICPs). Thus the requisite spectroscopic data for Ar I and 11-principally atomic transition probabilities and lifetimes of various energy levels-haves had been the subject of numerous investigations. Nevertheless...

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Survey and Assessment of Available Measurements on Thermodynamic P...

By: Reiner Tlllner-Hoth

Technical Reference Publication

Introduction: The mixture (water and ammonia) is of special interest as a working fluid in absorption cycles, refrigeration, and heat recovery. Recently, such mixtures have been proposed for use in the Kalina cycle for increased efficiency in power generation. Water and ammonia are natural fluids which do not harm the environment. Therefore, they are also considered as alternative refrigerants to replace chlorofluorocarbons in some refrigeration applications. From the th...

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Experimental Stark Widths and Shifts for Non-Hydrogenic

By: N. Konjevic

Technical Reference Publication

Introduction: This review is to our knowledge the first attempt to critically evaluate and assemble the experimental material on Stark broadening parameters for isolated lines of ionized spectra. The experimental data have been largely acquired within the last 10 years and thus represent material obtained by comparatively modern techniques of plasma spectroscopy. The primary stimulus for this work has been the need for accurate and convenient determinations...

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The Calculated Thermodynamic Properties A4 Superfluid Helium-4

By: James S. Brooks

Technical Reference Publication

Introduction: Liquid helium is a rewarding subject for the study of thermodynamic properties, especially because helium 11, the lower temperature phase, exhibits the property or super fluidity. The hydrodynamics of this phase are extraordinary: both normal viscous behavior and superflow may be exhibited in closely related experiments. Phenomenologically, one speaks of a two-fluid behavior in which the fluid (of density p) acts dynamically as if a fraction of effective de...

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Evaluated Kinetic and Photochemical Data for Atmospheric Chemistry...

By: Roger Atkinsoll

Technical Reference Publication

Preface: This paper is Supplement VI to the original set of critically evaluated kinetic and photochemical rate parameters for atmospheric chemistry. Published by the CODATA Task Group on Gas Phase Chemical Kinetics in 1980 and subsequently in 1984. The original evaluation and Supplements I and II were primarily intended to furnish a kinetic data base for modeling middle atmosphere chemistry (10-55 km altitude). In 1985 the International Union of Pure and Applied Chemist...

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