Showing papers in "Journal of Physical and Chemical Reference Data in 1972"
TL;DR: The compilations of fundamental vibrational frequencies of molecules previously published as Tables of Molecular Vibrational Frequencies Part 5, Part 6, Part 7, and Part 8, which appeared in the Journal of Physical and Chemical Reference Data in 1972, 1973, and 1974, have been revised as mentioned in this paper.
Abstract: The compilations of fundamental vibrational frequencies of molecules previously published as Tables of Molecular Vibrational Frequencies Part 5, Part 6, Part 7, and Part 8, which appeared in the Journal of Physical and Chemical Reference Data in 1972, 1973, and 1974, have been revised. This Consolidated Volume II includes data on a total of 212 molecules in addition to those on 223 molecules included in Volume 1 (NSRDS‐NBS 39). Selected values of the fundamental vibrational frequencies are given for each molecule, together with observed infrared and Raman spectral data and citations to the original literature. The selection of vibrational fundamentals has been based on careful studies of the spectral data and comprehensive normal‐coordinate analyses. An estimate of the accuracy of the selected values is included. The tables provide a convenient source of information for those who require vibrational energy levels and related properties in molecular spectroscopy, thermodynamics, analytical chemistry, and other fields of physics and chemistry.
1,151 citations
TL;DR: The surface tension tables presented in this paper are the result of a literature survey, evaluation, and compilation of data of some 2200 pure liquid compounds, 226 of which were reported for a single temperature.
Abstract: The surface tension tables presented herein are the result of a literature survey, evaluation, and compilation of data of some 2200 pure liquid compounds, 226 of which were reported for a single temperature. These are arranged with related compounds in the increasing order of their molecular weights. As far as possible the method of measurement, nature of atmosphere to which the liquid was exposed during measurements, and the estimated accuracy are given for each liquid. The tabulated values were calculated from the derived results of directly measured quantities reported in the literature of many countries from about 1874 to 1969. Preliminary plots of the experimentally measured quantities indicated that the surface tensions of the liquid compounds are linear functions of the temperature over the reported operational range. The principle of least squares was applied to experimental surface tension values to establish the regression curves and their equations. The constants of the equations (slope and intercept), together with the standard deviations are given for each compound. The selection factors establishing criteria of quality of surface tension data are discussed. These include (a) method of measurement, (b) purity of compound, (c) quality of apparatus and assembly, (d) experimental procedure (experimentation), (e) reliability of measurements (most probable values), (f) experience of investigator, and (g) availability of data. There are 274 references listed alphabetically.
1,089 citations
TL;DR: In this paper, the osmotic coefficients and mean activity coefficients of uni-univalent electrolytes in aqueous solutions at 25 °C were derived using the molality or weight basis.
Abstract: This paper gives values for the osmotic coefficients and mean activity coefficients of uni‐univalent electrolytes in aqueous solutions at 25 °C. The values are expressed on the molality or weight basis. The data available in the literature have been corrected to the presently accepted scales of atomic weights (1969) and temperature (IPST 1968) and, where necessary, to the absolute electrical units of 1969 and the fundamental constants of 1963. The selected values of osmotic coefficients and mean activity coefficients for individual electrolytes have been made internally consistent thermodynamically. In some cases estimated values are given; in other cases, references only are given when the data are sparse or unsuited to critical evaluation. Values of the osmotic coefficients and mean activity coefficients of 79 compounds are given together with the standard deviation, variance, and normalized standard deviation of their fit to equations which express these quantities as functions of electrolyte concentration. Finally, literature references are given to data on 51 additional uni‐univalent electrolytes.
1,066 citations
TL;DR: In this paper, diffusion coefficients of binary mixtures of dilute gases are comprehensively compiled, critically evaluated, and correlated by new semi-empirical expressions, and intercomparison of their results helps establish reliability limits for the data, which depend strongly on temperature.
Abstract: Diffusion coefficients of binary mixtures of dilute gases are comprehensively compiled, critically evaluated, and correlated by new semi‐empirical expressions. There are seventy‐four systems for which the data are sufficiently extensive, consistent and accurate to allow diffusion coefficients to be recommended with confidence. Deviation plots are given for most of these systems. Almost every gaseous diffusion coefficient which was experimentally determined and reported prior to 1970 can be obtained from the annotated bibliography and table of gas pairs. A detailed analysis of experimental methods is given, and intercomparison of their results helps establish reliability limits for the data, which depend strongly on temperature. Direct measurements are supplemented by calculations based on knowledge of intermolecular forces derived from independent sources—molecular beam scattering for high temperatures, and London dispersion constants for low temperatures. In addition, diffusion coefficients for several mixtures are obtained from experimental data on mixture viscosities and thermal diffusion factors. Combination of all these results gives diffusion coefficients over a very extensive temperature range, from very low temperatures to 10 000 K. All data are corrected for composition dependence and for quantum effects. New semi‐empirical equations are derived for making such corrections easily.
948 citations
TL;DR: In this article, a critical review and compilation of the observed and predicted spectroscopic data on O2 and its ions O2−, O2+ and O22+ is presented.
Abstract: This is a critical review and compilation of the observed and predicted spectroscopic data on O2 and its ions O2−, O2+ and O22+ The ultraviolet, visible, infrared, Raman, microwave, and electron paramagnetic resonance spectra are included. Each electronic band system is discussed in detail, and tables of band origins and heads are given. The microwave and EPR data are also tabulated. Special subjects such as the dissociation energy of O2, perturbations, and predissociations are discussed. Potential energy curves are given, as well as f‐values, Franck‐Condon integrals, and other intensity factors. A summary table lists the molecular constants for all known electronic states of O2 and O2+ Electronic structure and theoretical calculations are also discussed.
875 citations
TL;DR: In this article, the authors provide recommended or estimated thermal conductivity values for all the elements over the full temperature ranges where experimental data are available or reliable extrapolations or estimations can be made.
Abstract: This is the abridged version of a comprehensive volume on the thermal conductivity of the elements. It contains recommended reference values resulting from critical evaluation, analysis, and synthesis of all the available data. It also gives estimated values for those elements for which no thermal conductivity data are available. Thus, the work provides recommended or estimated thermal conductivity values for all the elements over the full temperature ranges where experimental data are available or reliable extrapolations or estimations can be made. The results on each element are presented in both graphical and tabular forms. Summary graphs arranged by group in the periodic table are also given.
677 citations
TL;DR: The literature dealing with the high-temperature behavior of inorganic nitrates and nitrites has been critically reviewed as mentioned in this paper, where values of (GTo−H298o)/T of the reactants and products of the decomposition reactions were calculated and have been tabulated from 298 K up to as high a temperature as possible.
Abstract: The literature dealing with the high‐temperature behavior of inorganic nitrates and nitrites has been critically reviewed. Values of (GTo−H298o)/T of the reactants and products of the decomposition reactions were calculated and have been tabulated from 298 K up to as high a temperature as possible. Equilibrium constants and partial pressures were tabulated. Auxiliary data on phase transitions and densities have also been included. Qualitative information about the thermal decomposition of the salts is reviewed.
244 citations
TL;DR: In this article, the results of a recent investigation of the carbon monoxide absorption spectrum between 1060 and 1900 A. The authors present an atlas of the spectrum with band assignments arranged by wavelength.
Abstract: This atlas summarizes the results of a recent investigation of the carbon monoxide absorption spectrum between 1060 and 1900 A. Twelve electronic transitions are observed in this region; four electric dipole allowed electric transitions from the ground state X 1Σ+ to the A 1Π, B 1Σ+, C 1Σ+, and E 1Π states, and eight forbidden transitions to the a′ 3Σ+, e 3Σ‐, a 3Π, D 1Δ, d 3Δi, I 1Σ‐, j 3Σ+, and c 3Π states. The following items are presented in the atlas:(1) A photograph of the spectrum with band assignments;(2) a table of band head measurements and assignments arranged by wavelength;(3) a summary of the spectroscopic constants and potential curve for each electronic state;(4) a line list, arranged by wavelength, of the observed rotational lines of the allowed transitions.
239 citations
TL;DR: A critical review of experimental technique for measuring high pressures has been made in this paper, which includes discussions relating to the establishment of a primary pressure scale using the free-piston gage, selection and precise measurement of identifiable phase changes as fixed pressure points, and the use of interpolation and extrapolation techniques such as resistance gages, equations of state and optical changes.
Abstract: A critical review of experimental technique for measuring high pressures has been made. The broad coverage includes discussions relating to (a) the establishment of a primary pressure scale using the free‐piston gage, (b) the selection and precise measurement of identifiable phase changes as fixed pressure points, and (c) the use of interpolation and extrapolation techniques such as resistance gages, equations of state, and optical changes. The emphasis is on static pressure measurements above 10 kbar, but shock measurements are also considered for completeness. The pressure values to be associated with the fixed points have been analyzed in detail. Temperature measurement in the high pressure environment is also reviewed. The accuracy with which pressures can be measured has been carefully considered; the maximum accuracies now obtainable are considered to be of the order of 0.02 percent at 8 kbar, 0.25 percent at 25 kbar, 2 percent at 50 kbar, and 4 percent at 100 kbar.
204 citations
TL;DR: In this paper, the authors reported the values of the heats of combustion and the formation of 719 organic compounds, which pertain to compounds containing the elements carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur (CHNOPS).
Abstract: Selected values of the heats of combustion and heats of formation of 719 organic compounds are reported here. The data tabulated pertain to compounds containing the elements carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur (CHNOPS). The information is arranged according to classes of compounds and within each class, compounds are arranged by empirical formula. The general classes covered are: hydrocarbons, alcohols, phenols, polyols, ethers, aldehydes, ketones, acids,acid anhydrides, esters, steroids, lactones, carbohydrates, heterocyclic oxygen compounds, amines, amides, urea derivatives, guanidine derivatives, amino acids,peptides, alkaloids, heterocyclic nitrogen compounds,porphyrins, organic sulfur compounds, and organic phosphorus compounds. When a selection was made from among several investigators, commentary is provided to indicate the choice, and usually some relevant data. The number of references cited is 596. An alphabetical compound index is provided which gives the name, page number, empirical formula, and the Wiswesser Line Notation (WLN), for each compound.
197 citations
TL;DR: In this article, the viscosity and thermal conductivity of gaseous and liquid argon have been evaluated and represented by empirical functions, and uncertainties of 2% or better for pressures below 100 MPa, and 3% for higher pressures are assigned.
Abstract: Data for the viscosity and thermal conductivity of gaseous and liquid argon have been evaluated and represented by empirical functions. Tables for the viscosity from 86 to 500 K for pressures to 400 MPa, and for the thermal conductivity from 90 to 500 K for pressures to 200 MPa are presented. For the viscosity, uncertainties of 2% or better for pressures below 100 MPa, and 3% for higher pressures are assigned. For the thermal conductivity the uncertainties are 4% for temperatures below 150 K and 3% or better for temperatures above. The enhancement in the conductivity close to the critical point has been accounted for. The status of the argon transport data and the philosophy of fitting them are reviewed.
TL;DR: The literature pertinent to reactions of the hydroxyl radical has been reviewed in this paper, and the recommended values in cm3 mol−1·s−1, the temperature range, and the uncertainty are: k1=1.55×1012, 300 K,
Abstract: The literature pertinent to reactions of the hydroxyl radical has been reviewed. An extensive discussion is given for reactions of the hydroxyl radical with itself and with CO, H2, and CH4. These four reactions are: (1) OH+OH→H2O+O; (2) CO+OH→CO2+H; (3) H2+OH→H2O+H; (4) CH4+OH→CH3+H2O.Values are recommended for k1 and k2 and for the ratio k3/k2 and k4/k2. These rate ratios are used with the previously established value of k2 to obtain recommended values for k3 and k4.The recommended values in cm3 mol‐1·s‐1, the temperature range, and the uncertainty are: k1=1.55×1012, 300 K, log k±0.1, 05k2=3.1×1011 exp(−300/T), 300−2000 K, log k±.3k3/k2=73 exp(2300/T), 300−2000 K, log k3/k2±.3k3=3.8×1013 exp(−2600/T), 300−2000 K, log k±.3k4/k2=92 exp(2200/T), 300−2000 K, log k3/k2±.3k4=2.85×1013 exp(−2500/T), 300−2000 K, log k±.7. Rate expressions are also recommended for a number of other hydroxyl reactions whose rates are less well established.
TL;DR: In this paper, the coefficients of evaporation and condensation far from equilibrium for simple substances are presented, together with a rationale for the exclusion or choice of data and an estimate of the precision measure.
Abstract: Tables of selected data on the coefficients of evaporation and condensation far from equilibrium for simple substances are presented, together with a rationale for the exclusion or choice of data and an estimate of the precision measure.
TL;DR: In this article, the electrical conductance, density, viscosity, and surface tension properties of binary mixtures of different types of nitrates have been systematically collected and evaluated.
Abstract: Data on the electrical conductance, density, viscosity, and surface tension of nitrate—nitrate, nitrite—nitrite, and nitrite—nitrate mixtures have been systematically collected and evaluated. Results are given for some 71 binary mixtures over a range of compositions and temperatures. Values of the above properties for the single salts have been updated in accord with previously advanced recommendations.
TL;DR: In this paper, the available data on the microwave spectra of formaldehyde, formamide, and thioformaldehyde are critically reviewed for information applicable to radio astronomy, such as rotational constants, centrifugal distortion parameters, dipole moments, hyperfine coupling constants, and structural parameters are tabulated.
Abstract: The available data on the microwave spectra of formaldehyde, formamide, and thioformaldehyde are critically reviewed for information applicable to radio astronomy. Molecular data such as rotational constants, centrifugal distortion parameters, dipole moments, hyperfine coupling constants, and structural parameters are tabulated. Observed rotational transitions are presented for the astronomically interesting isotopic forms of these molecules when available. Detailed centrifugal distortion calculations have been carried out for the most abundant isotopic forms of these molecules, namely, H212C16O, H213C16O, 14NH212CH16O, and H212C32S. Transitions have been predicted and tabulated for the frequency ranges 1 MHz to 300 GHz for H212C16O,100 MHz to 300 GHz for H213C16O,500 MHz to 180 GHz for 14NH212CH16O,100 MHz to 300 GHz for H212C32S. All predicted transitions include 95 percent confidence limits; measured transition error limits have been reproduced from the original literature. References are given for all...
TL;DR: In this article, the compilations of fundamental vibrational frequencies of molecules previously published as NSRDS-NBS-6, NRSD−NBS 11, NBS-17, and NBS−39 were extended to 58 additional molecules.
Abstract: The compilations of fundamental vibrational frequencies of molecules previously published as NSRDS—NBS—6, NRSD—NBS—11, NSRDS—NBS—17, and NSRDS—NBS—39, are extended to 58 additional molecules. Selected values of the fundamental vibrational frequencies are given for each molecule, together with observed infrared and Raman spectral data and citations to the original literature. The selection of vibrational fundamentals has been based on careful studies of the spectral data and comprehensive normal‐coordinate analyses. An estimate of the accuracy of the selected values is included. The tables provide a convenient source of information for those who require vibrational energy levels and related properties in molecular spectroscopy, thermodynamics, analytical chemistry, and other fields of physics and chemistry.
TL;DR: In this article, the critical supersaturations for homogeneous and heterogeneous nucleation of droplets from the vapor and on the natural stationary concentration of gaseous ions are tabulated and plotted.
Abstract: Selected values of critical supersaturations for homogeneous nucleation of droplets from the vapor and for heterogeneous nucleation of droplets on the natural stationary concentration of gaseous ions are tabulated and plotted, and a rationale is given for selection of these data.