Jump to Content
View Cart
Top 20 Most Read Articles
November 2010
The 20 articles with the most full-text downloads during the month, in descending order.
 |
J. Phys. Chem. Ref. Data 39, 043101 (2010); http://dx.doi.org/10.1063/1.3309507 (942 pages) Online Publication Date: 4 October 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
A compendium of phase change enthalpies published within the period 1880–2010 is reported. Phase change enthalpies including fusion, vaporization, and sublimation are included for organic, organometallic, and a few inorganic compounds. This compendium is a combination of three previous series focusing on phase change enthalpies updated to 2009. Sufficient data are presently available for some compounds to permit thermodynamic cycles to be constructed, an important manner of evaluating the reliability of the measurements. Temperature adjustments of phase change enthalpies from the temperature of measurement to the standard reference temperature, T = 298.15 K, are briefly disscussed and a protocol for doing so is illustrated.
|
|||
|
Show PACS
|
|||
|
|
Physical Properties of Ionic Liquids: Database and Evaluation J. Phys. Chem. Ref. Data 35, 1475 (2006); http://dx.doi.org/10.1063/1.2204959 (43 pages) Online Publication Date: 10 October 2006
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
A comprehensive database on physical properties of ionic liquids (ILs), which was collected from 109 kinds of literature sources in the period from 1984 through 2004, has been presented. There are 1680 pieces of data on the physical properties for 588 available ILs, from which 276 kinds of cations and 55 kinds of anions were extracted. In terms of the collected database, the structure-property relationship was evaluated. The correlation of melting points of two most common systems, disubstituted imidazolium tetrafluoroborate and disubstituted imidazolium hexafluorophosphate, was carried out using a quantitative structure-property relationship method.
|
|||
|
Show PACS
|
|||
|
|
Heat Capacity of Liquids: Critical Review and Recommended Values. Supplement II J. Phys. Chem. Ref. Data 39, 013103 (2010); http://dx.doi.org/10.1063/1.3182831 (404 pages) Online Publication Date: 31 March 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
A study was carried out in which new experimental data on heat capacities of pure liquid organic and some inorganic compounds were compiled and critically evaluated and recommended values provided. The bulk of the compiled data covers data published in the primary literature between 2000 and 2006 and includes some data published in 2007. However, some data from older sources are also included. The list of compound families covered was extended to include ionic liquids. Parameters of correlating equations for the temperature dependence of heat capacities of liquids were developed. This paper is an update of a two volume monograph entitled Heat Capacity of Liquids: Critical Review and Recommended Values by
Zábranský et al. [J. Phys. Chem. Ref. Data 30, 1199 (2001)]
, which was published in 1996 in the Journal of Physical and Chemical Reference Data as Monograph No. 6, and of Supplement I.
|
|||
|
Show PACS
|
|||
|
|
J. Phys. Chem. Ref. Data 39, 043102 (2010); http://dx.doi.org/10.1063/1.3474238 (47 pages) Online Publication Date: 27 October 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
A critical review of the thermodynamic properties of the lanthanide and actinide elements is presented. The available literature data for the solid, liquid, and gaseous state have been collected and recommended values are presented. In case experimental data are missing, estimates have been made based on the trends in the two series.
|
|||
|
Show PACS
|
|||
|
|
J. Phys. Chem. Ref. Data 39, 023101 (2010); http://dx.doi.org/10.1063/1.3380845 (13 pages) Online Publication Date: 1 June 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
The IUPAC-NIST Solubility Data Series (SDS) is an ongoing project that provides comprehensive reviews of published data for solubilities of gases, liquids and solids in liquids or solids. Data are compiled in a uniform format, evaluated and, where data from independent sources agree sufficiently, recommended values are proposed. This paper is a guide to the SDS and is intended for the benefit of both those who use the SDS as a source of critically evaluated solubility data and who prepare compilations and evaluations for future volumes. A major portion of this paper presents terminology and nomenclature currently recommended by IUPAC and other international bodies and relates these to obsolete forms that appear in the older solubility literature. In addition, this paper presents a detailed guide to the criteria and procedures used in data compilation, evaluation, and presentation and considers special features of solubility in gas+liquid, liquid+liquid, and solid+liquid systems. In the past, much of this information was included in introductory sections of individual volumes of the SDS. However, to eliminate repetitive publication, this information has been collected, updated, and expanded for separate publication here.
|
|||
|
Show PACS
|
|||
|
|
Heat Capacity of Room-Temperature Ionic Liquids: A Critical Review J. Phys. Chem. Ref. Data 39, 033108 (2010); http://dx.doi.org/10.1063/1.3463478 (23 pages) Online Publication Date: 27 September 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
Experimental data on heat capacity of room-temperature ionic liquids in the liquid state were compiled and critically evaluated. The compilation contains data for 102 aprotic ionic liquids from 63 literature references and covers the period of time from 1998 through the end of February 2010. Parameters of correlating equations for temperature dependence of the heat capacities were developed.
|
|||
|
Show PACS
|
|||
|
|
J. Phys. Chem. Ref. Data 39, 033103 (2010); http://dx.doi.org/10.1063/1.3449176 (20 pages) Online Publication Date: 13 August 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
Following a critical review of spectroscopic data for neutral strontium (Z = 38), the energy levels, with designations and uncertainties, have been tabulated. Wavelengths with classifications, intensities, and transition probabilities have also been reviewed. In addition, the 5s 2S1/2, 4d 2D3/2, and 4d 2D5/2 ionization energies have been listed. A summary of the current state of measurements of the Sr I 5s2 1S0-5s5p 3P0∘, F = 9/2 atomic clock transition, and other isotopic observations has also been included.
|
|||
|
Show PACS
|
|||
|
|
J. Phys. Chem. Ref. Data 31, 387 (2002); http://dx.doi.org/10.1063/1.1461829 (149 pages) Online Publication Date: 7 June 2002
Full Text:
|
Download PDF
|
||
|
Show Abstract
In 1995, the International Association for the Properties of Water and Steam (IAPWS) adopted a new formulation called “The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use”, which we abbreviate to IAPWS-95 formulation or IAPWS-95 for short. This IAPWS-95 formulation replaces the previous formulation adopted in 1984. This work provides information on the selected experimental data of the thermodynamic properties of water used to develop the new formulation, but information is also given on newer data. The article presents all details of the IAPWS-95 formulation, which is in the form of a fundamental equation explicit in the Helmholtz free energy. The function for the residual part of the Helmholtz free energy was fitted to selected data for the following properties: (a) thermal properties of the single-phase region (pρT) and of the vapor–liquid phase boundary (pσρ′ρ″T), including the phase-equilibrium condition (Maxwell criterion), and (b) the caloric properties specific isochoric heat capacity, specific isobaric heat capacity, speed of sound, differences in the specific enthalpy and in the specific internal energy, Joule–Thomson coefficient, and isothermal throttling coefficient. By applying modern strategies for optimizing the functional form of the equation of state and for the simultaneous nonlinear fitting to the data of all mentioned properties, the resulting IAPWS-95 formulation covers a validity range for temperatures from the melting line (lowest temperature 251.2 K at 209.9 MPa) to 1273 K and pressures up to 1000 MPa. In this entire range of validity, IAPWS-95 represents even the most accurate data to within their experimental uncertainty. In the most important part of the liquid region, the estimated uncertainty of IAPWS-95 ranges from ±0.001% to ±0.02% in density, ±0.03% to ±0.2% in speed of sound, and ±0.1% in isobaric heat capacity. In the liquid region at ambient pressure, IAPWS-95 is extremely accurate in density (uncertainty ⩽±0.0001%) and in speed of sound (±0.005%). In a large part of the gas region the estimated uncertainty in density ranges from ±0.03% to ±0.05%, in speed of sound it amounts to ±0.15% and in isobaric heat capacity it is ±0.2%. In the critical region, IAPWS-95 represents not only the thermal properties very well but also the caloric properties in a reasonable way. Special interest has been focused on the extrapolation behavior of the new formulation. At least for the basic properties such as pressure and enthalpy, IAPWS-95 can be extrapolated up to extremely high pressures and temperatures. In addition to the IAPWS-95 formulation, independent equations for vapor pressure, the densities, and the most important caloric properties along the vapor–liquid phase boundary, and for the pressure on the melting and sublimation curve, are given. Moreover, a so-called gas equation for densities up to 55 kg m−3 is also included. Tables of the thermodynamic properties calculated from the IAPWS-95 formulation are listed in the Appendix. © 2002 American Institute of Physics. |
|||
|
Show PACS
|
|||
|
|
Reference Data for the Density and Viscosity of Liquid Copper and Liquid Tin J. Phys. Chem. Ref. Data 39, 033105 (2010); http://dx.doi.org/10.1063/1.3467496 (8 pages) Online Publication Date: 27 August 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
The available experimental data for the density and viscosity of liquid copper and tin have been critically examined with the intention of establishing a density and a viscosity standard. All experimental data have been categorized into primary and secondary data according to the quality of measurement specified by a series of criteria. The proposed standard reference correlations for the density of copper and tin are characterized by standard deviations of 1.3% and 1.0% at the 95% confidence level, respectively. The standard reference correlations for the viscosity of copper and tin are characterized by standard deviations of 6.3% and 20% at the 95% confidence level, respectively.
|
|||
|
Show PACS
|
|||
|
|
J. Phys. Chem. Ref. Data 37, 1765 (2008); http://dx.doi.org/10.1063/1.2956740 (89 pages) Online Publication Date: 15 October 2008
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
This volume presents solubility data for rare earth metal chlorides in water and in ternary and quaternary aqueous systems. The material is divided into three parts: scandium group (Sc, Y, La), light lanthanide (Ce-Eu), and heavy lanthanide (Gd-Lu) chlorides; this part covers the scandium group. Compilations of all available experimental data are introduced for each rare earth metal chloride with a corresponding critical evaluation. Every such evaluation contains a tabulated collection of all solubility results in water, a scheme of the water-rich part of the equilibrium (Y, La, Ln)Cl3–H2O phase diagram, solubility equation(s), a selection of suggested solubility data, and a discussion of the multicomponent systems. Because the ternary and quaternary systems were almost never studied more than once, no critical evaluations or systematic comparisons of such data were possible. Only simple chlorides (no complexes) are treated as the input substances in this work. The literature (including a thorough coverage of papers in Chinese and Russian) has been covered through the middle of 2007.
|
|||
|
Show PACS
|
|||
|
|
Critically Evaluated Thermochemical Properties of Polycyclic Aromatic Hydrocarbons J. Phys. Chem. Ref. Data 37, 1855 (2008); http://dx.doi.org/10.1063/1.2955570 (142 pages) Online Publication Date: 23 October 2008
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
Experimental thermochemical properties of benzene, toluene, and 63 polycyclic aromatic hydrocarbons, published within the period 1878–2008 (over 350 references), are reported. Available experimental data for the enthalpies of combustion used to calculate enthalpies of formation in the condensed state, combined with sublimation, vaporization, and fusion enthalpies, are critically evaluated. Whenever possible, recommended values for these thermochemical properties and for the enthalpies of formation in the gas state at T = 298.15 K are provided.
|
|||
|
Show PACS
|
|||
|
|
Isotopic Compositions of the Elements, 2001 J. Phys. Chem. Ref. Data 34, 57 (2005); http://dx.doi.org/10.1063/1.1836764 (11 pages) Online Publication Date: 21 March 2005
Full Text:
|
Download PDF
|
||
|
Show Abstract
The Commission on Atomic Weights and Isotopic Abundances of the International Union of Pure and Applied Chemistry completed its last review of the isotopic compositions of the elements as determined by isotope-ratio mass spectrometry in 2001. That review involved a critical evaluation of the published literature, element by element, and forms the basis of the table of the isotopic compositions of the elements (TICE) presented here. For each element, TICE includes evaluated data from the “best measurement” of the isotope abundances in a single sample, along with a set of representative isotope abundances and uncertainties that accommodate known variations in normal terrestrial materials. The representative isotope abundances and uncertainties generally are consistent with the standard atomic weight of the element Ar(E) and its uncertainty U[Ar(E)] recommended by CAWIA in 2001. © 2005 American Institute of Physics. |
|||
|
Show PACS
|
|||
|
|
Energy Levels and Observed Spectral Lines of Ionized Argon, Ar II through Ar XVIII J. Phys. Chem. Ref. Data 39, 033101 (2010); http://dx.doi.org/10.1063/1.3337661 (162 pages) Online Publication Date: 29 July 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
The energy levels and observed spectral lines of ionized argon atoms, in all stages of ionization, have been compiled. Sufficient experimental data were found to generate level and line tables for Ar II through Ar XV. For Ar XVI a mix of experimental and theoretical data were used. Because of the superiority of the theoretical data for Ar XVII and Ar XVIII, theoretical values are compiled for the energy levels and the lines are calculated from them. Experimental g-factors are included for Ar II. A value, either experimental, semiempirical, or theoretical, is included for the ionization energy of each ion.
|
|||
|
Show PACS
|
|||
|
|
Framework-Type Determination for Zeolite Structures in the Inorganic Crystal Structure Database J. Phys. Chem. Ref. Data 39, 033102 (2010); http://dx.doi.org/10.1063/1.3432459 (45 pages) Online Publication Date: 6 August 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
In this work a structural characterization of zeolite crystals is performed by identifying the framework type to which each zeolite belongs. The framework type is assigned for 1433 zeolite database entries in the FIZ/NIST Inorganic Crystal Structure Database (ICSD) populating 95 framework types. These entries correspond to both natural and synthetic zeolites. Each ICSD entry is based on published work containing crystallographic information of the zeolite crystalline structure and some physical and chemical data. Today, the Structure Commission of the International Zeolite Association recognizes crystalline materials as belonging to the “zeolite” family only if they possess one of the approved framework types by the organization. Such information is of fundamental importance for identifying zeolites, for reference, for zeolite standards, for supporting the discovery of new zeolites, and for crystalline substance selection based on application. Unfortunately, framework-type information is not contained in the ICSD records. The long term goal of this work is filling such gap. Although the ICSD contains an extensive collection of zeolites, inclusion of zeolites belonging to the 191 accepted framework types could substantially expand such collection. The structural determination was achieved via several structural analysis methods based on numerical-computer implementations.
|
|||
|
Show PACS
|
|||
|
|
Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen J. Phys. Chem. Ref. Data 38, 721 (2009); http://dx.doi.org/10.1063/1.3160306 (28 pages) Online Publication Date: 4 September 2009
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
If the potential for a boom in the global hydrogen economy is realized, there will be an increase in the need for accurate hydrogen thermodynamic property standards. Based on current and anticipated needs, new fundamental equations of state for parahydrogen, normal hydrogen, and orthohydrogen were developed to replace the existing property models. To accurately predict thermophysical properties near the critical region and in liquid states, the quantum law of corresponding states was applied to improve the normal hydrogen and orthohydrogen formulations in the absence of available experimental data. All three equations of state have the same maximum pressure of 2000 MPa and upper temperature limit of 1000 K. Uncertainty estimates in this paper can be considered to be estimates of a combined expanded uncertainty with a coverage factor of 2 for primary data sets. The uncertainty in density is 0.04% in the region between 250 and 450 K and at pressures up to 300 MPa. The uncertainties of vapor pressures and saturated liquid densities vary from 0.1% to 0.2%. Heat capacities are generally estimated to be accurate to within 1%, while speed-of-sound values are accurate to within 0.5% below 100 MPa.
|
|||
|
Show PACS
|
|||
|
|
Handbook of Basic Atomic Spectroscopic Data J. Phys. Chem. Ref. Data 34, 1559 (2005); http://dx.doi.org/10.1063/1.1800011 (701 pages) Online Publication Date: 28 September 2005
Full Text:
|
Download PDF
|
|||||||||||||||||
|
Show Abstract
© 2005 American Institute of Physics. |
||||||||||||||||||
|
Show PACS
|
||||||||||||||||||
|
|
J. Phys. Chem. Ref. Data 36, 1 (2007); http://dx.doi.org/10.1063/1.2360986 (18 pages) Online Publication Date: 8 February 2007
Full Text:
Read Online (HTML)
|
Download PDF
|
|||
|
Show Abstract
All the currently available experimental permittivity data for pure water are used to derive an interpolation function that precisely represents ε(ν,t,) at standard atmospheric pressure, for frequencies and temperatures in the ranges 0 ⩽ ν ⩽ 25 THz and 0 ⩽ t ⩽ 100 °C. The permittivity data is represented in terms of relaxations and resonances processes. There are three relaxations in the microwave region and two resonances in the far infrared. The temperature dependence of the relaxation and resonance parameters are determined. For example, at 25 °C the three relaxation frequencies are 18.56 GHz, 167.83 GHz, 1.944 THz and the two resonance frequencies are 4.03 and 14.48 THz.
|
||||
|
Show PACS
|
||||
|
|
J. Phys. Chem. Ref. Data 37, 1997 (2008); http://dx.doi.org/10.1063/1.3005673 (12 pages) Online Publication Date: 14 November 2008
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are of global concern due to their persistence, their tendency to bioaccumulate, and their extremely high toxicity. The fate of the PCDD/Fs in the environment is largely determined by their physical-chemical properties, such as solubility in water (SW, mol m−3), solubility in octanol (SO, mol m−3), and vapor pressure (P, Pa). It is not unusual that the range of reported values for a given property varies over several orders of magnitude, especially for the highly chlorinated congeners, and consequently, it is a challenge to select physical-chemical property data from the literature for use in chemical fate and risk assessments. In the current study, physical-chemical property data [P, SW, SO, Henry’s law constant (H), partitioning coefficients between octanol-water (KOW) and octanol-air (KOA)] for 15 DDs and 17 DFs at 293–299 K are compiled from the literature and evaluated to select literature derived values that are then adjusted to conform to thermodynamic constraints using a least-squares adjustment procedure. We also present an analysis of available data on internal energies of phase change (ΔUA, ΔUW, ΔUO, ΔUOW, ΔUAW, ΔUOA) at 298 K, which describe the temperature dependence of the partitioning properties. The final adjusted values (FAVs) derived from this study are recommended as physical-chemical property data for PCDD/Fs for use in environmental fate modeling. The FAVs for internal energies of phase change can be used as a first approximation for estimating properties at temperatures other than 298 K.
|
|||
|
Show PACS
|
|||
|
|
Experimental Vibrational Zero-Point Energies: Diatomic Molecules J. Phys. Chem. Ref. Data 36, 389 (2007); http://dx.doi.org/10.1063/1.2436891 (9 pages) Online Publication Date: 18 April 2007
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
Vibrational zero-point energies (ZPEs), as determined from published spectroscopic constants, are derived for 85 diatomic molecules. Standard uncertainties are also provided, including estimated contributions from bias as well as the statistical uncertainties propagated from those reported in the spectroscopy literature. This compilation will be helpful for validating theoretical procedures for predicting ZPEs, which is a necessary step in the ab initio prediction of molecular energetics.
|
|||
|
Show PACS
|
|||
|
|
Elastic Cross Sections for Electron Collisions with Molecules Relevant to Plasma Processing J. Phys. Chem. Ref. Data 39, 033106 (2010); http://dx.doi.org/10.1063/1.3475647 (24 pages) Online Publication Date: 1 September 2010
Full Text:
Read Online (HTML)
|
Download PDF
|
||
|
Show Abstract
Absolute electron-impact cross sections for molecular targets, including their radicals, are important in developing plasma reactors and testing various plasma processing gases. Low-energy electron collision data for these gases are sparse and only the limited cross section data are available. In this report, elastic cross sections for electron-polyatomic molecule collisions are compiled and reviewed for 17 molecules relevant to plasma processing. Elastic cross sections are essential for the absolute scale conversion of inelastic cross sections, as well as for testing computational methods. Data are collected and reviewed for elastic differential, integral, and momentum transfer cross sections and, for each molecule, the recommended values of the cross section are presented. The literature has been surveyed through early 2010.
|
|||
|
Show PACS
|
|||
This Publication
Scitation
Google Scholar
PubMed