摘要:

A critical review of all experimental data on Stark widths and shifts of spectral lines of neutral elements published during the period 1976–1982 has been carried out. This work represents an extension and update of an earlier review which covered the period before 1976. Data tables containing the selected experimental Stark broadening parameters are presented together with estimated accuracies. Comparisons with comprehensive calculations based on the semiclassical theory are made whenever possible.

ISSN:0047-2689    

DOI:10.1063/1.555715

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A new critical review of the available experimental data on the Stark widths and shifts for lines of non‐hydrogenic ionized spectra has been carried out which covers the period from 1976 to the present and represents a continuation of an earlier critical review. The relevant literature, compiled by the NBS Data Center on Atomic Lines Shapes and Shifts as well as by the present authors, was critically evaluated, and data tables containing the selected experimental Stark broadening parameters have been assembled. The data are arranged according to spectra and elements and these are presented in alphabetical order. The accuracy of the experimental data is estimated on the basis of guidelines developed during the previous review. Comparisons with theoretical results are made whenever possible since the comparison with theory has often been a principal motivation for the experiments.

ISSN:0047-2689    

DOI:10.1063/1.555716

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A review is presented of the existing measurements of the triple‐point temperaturesTtpof deuterium. All data are adjusted to a common temperature scale, and error limits are proposed where none was provided in the source publications. The effects of sample contamination are also considered. Impurity corrections, based on estimates from vapor‐pressure measurements, are applied to the results. The analytical representationTtp(x)=18.680+0.155x, wherexis the fraction ofp‐D2(J=1), is found to representTtpto ±0.010 K. The value, 18.723±0.010 K, measured most recently on normal deuterium is consistent with the most accurate and precise of the earlier data.

ISSN:0047-2689    

DOI:10.1063/1.555717

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

The available data on gas phase basicities and proton affinities of molecules are compiled and evaluated. Tables giving the molecules ordered (1) according to proton affinity and (2) according to empirical formula, sorted alphabetically are provided. The heats of formation of the molecules and the corresponding protonated species are also listed.

ISSN:0047-2689    

DOI:10.1063/1.555719

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A large number of measurements describing the isotopic composition of the elements using a variety of analytical methods have been reported since the discovery of the first isotope in 1912. During the past several decades, however, mass spectrometric methods have been used, almost exclusively, to determine the isotopic composition, and thus the atomic weights, of the elements. This evaluated compilation reports the literature references for all complete mass spectrometric measurements published during the period 1920 through 1983. Also given are the isotopic compositions, the isotope ratios, the atomic weights calculated from the data, the appropriate nuclidic masses and an evaluation of the errors of the measurements. For each polynuclidic element, a best measurement has been selected.

ISSN:0047-2689    

DOI:10.1063/1.555720

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

The paper documents the development of the available information for the thermal conductivity of fluid H2O since the promulgation of the first international formulation for the transport properties of water substance in 1964. As a result of this development, the International Association for the Properties of Steam has adopted new recommended interpolating equations for the thermal conductivity of fluid H2O at pressures up to 100 MPa and at temperatures up to 800 °C. These new international equations are discussed.

ISSN:0047-2689    

DOI:10.1063/1.555718

出版商:AIP    

年代:1984

数据来源: AIP