摘要:

A critical review of all available data on the Stark broadening and shifts of spectral lines of neutral elements has been undertaken. Over 200 papers compiled by the NBS Data Center on Atomic Line Shapes and Shifts have been evaluated, and of these, 68 were chosen as having reviewable data. Only those papers with properly determined critical factors, such as electron density, temperature, spatial homogeneity, optical depth, and instrument function deconvolution, were selected.

ISSN:0047-2689    

DOI:10.1063/1.555532

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

A critical review of all available data on the Stark widths and shifts for lines of non‐hydrogenic ionized spectra has been carried out. The relevant literature compiled by the NBS Data Center on Atomic Line Shapes and Shifts was critically evaluated, and from this evaluation 54 papers were found to satisfy all requirements and thus selected for this review. The most important factors determining the quality of plasma sources, diagnostic techniques, and line profile and shift determinations are discussed in detail in the first part of this review. In the second part the data tables containing the selected experimental Stark broadening parameters are presented. 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 review, and comparisons with theoretical results are made whenever possible.

ISSN:0047-2689    

DOI:10.1063/1.555533

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

This atlas presents the absorption spectrum between 1420 and 1250 Å of cold (−180 °C) nitric oxide gas, both14N16O and15N16O, photographed in first order of a 10.5 m vacuum spectrograph. The spectral region comprises the Rydberg series (s−,p−,d−, andf−) of the molecule, including their limits ofv=0, 1, and 2 of the ground state of the ion NO+. In addition it shows some valence bands. To each band are assigned quantum numbers. The assignment is based on the detailed study of the fine structure of the bands, measured on spectral plates obtained in high order of the same instrument. Accurate numerical results of these measurements are tabulated for 140 molecular levels. A short survey on the NO absorption spectrum is given.

ISSN:0047-2689    

DOI:10.1063/1.555534

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

The ideal gas thermodynamic properties (Cp0,S0,H0−H00, (H0−H00)/T, −(G′−H00)/T,&Dgr;Hf0, &Dgr;Gf0, and logKf) for propanone and 2‐butanone in the temperature range 0 to 1500 K and at 1 atm were calculated by statistical mechanical procedures, using rigid‐rotor and harmonic‐oscillator approximations. The internal rotation contributions to thermodynamic properties were evaluated by use of a partition function formed by summation of internal rotation energy levels. The calculated heat capacities and entropies are in agreement with the available experimental values.

ISSN:0047-2689    

DOI:10.1063/1.555535

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Refractive index data for 20 alkali halides are exhaustively surveyed, compiled, and analyzed. The most probable values at 293 K for the transparent region are generated for the materials for which experimental data are sufficiently abundant and reliable. Provisional values are also provided for the wavelength regions where available data are insufficient or missing. Reasonable estimations of refractive index for the very scantily measured materials were made by incorporating the dielectric constants and wavelengths of absorption peaks into a simplified dispersion equation. Temperature derivatives of refractive index for most of the alkali halides were unavailable. However, using the existing data for the five most commonly used alkali halides, novel empirical facts were discovered anddn/dTformulas were constructed for all of the alkali halides. The calculateddn/dTvalues agree remarkably well with the existing experimental data.

ISSN:0047-2689    

DOI:10.1063/1.555536

出版商:AIP    

年代:1976

数据来源: AIP

ISSN:0047-2689    

DOI:10.1063/1.555537

出版商:AIP    

年代:1976

数据来源: AIP