摘要:

This compilation of atomic spectral lines for the 10000 A˚ to 40000 A˚ region tabulates 8885 selected lines, belonging to 57 elements, extracted from computer based data records. The tables are divided into three sections. In section I the strong lines in the 10000 A˚ to 25000 A˚ range are listed for 27 elements. Section II is a table of classified and unclassified lines, arranged in order of increasing vacuum wavenumber. Section III consists of vacuum wavenumber tables, with appropriate energy level andJvalues for the classified lines, listed by element. Detailed explanation of the data and sources used for the compilation are given.

ISSN:0047-2689    

DOI:10.1063/1.555568

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

A critical evaluation of the mean activity and osmotic coefficients in aqueous solutions of the alkaline earth metal halides at 298.15 K is presented. Osmotic coefficients were calculated from direct vapor pressure measurements, from isopiestic measurements, and from freezing point depression measurements. Activity coefficients were calculated from electromotive force measurements on galvanic cells, both with and without transference, and from diffusion data. Given are empirical coefficients for three different correlating equations, obtained by a weighted least squares fit of the experimental data, and tables consisting of the activity coefficients of the halides, the osmotic coefficients and activity of water, and the excess Gibbs energy of the solution as a function of the molality fo

ISSN:0047-2689    

DOI:10.1063/1.555569

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

The available data on the microwave spectrum of the hydroxyl radical are critically reviewed for information applicable to radio astronomy. Molecular properties such as the rotational constants, spin‐orbit, spin‐spin and hyperfine coupling constants and centrifugal distortion parameters employed in or derived from the analysis are tabulated. All the observed and predicted transitions of16OH,16OD, and18OH below 300 GHz and lower state energy levels less than 4000 cm−1are presented for the ground vibrational state. The laboratory data on17OH is included, but no predicted transitions are presented due to the limited data available. In addition to the transition frequencies the table contains the calculated line strengths and energies of the levels involved in the transition. An extensive bibliography of laboratory and astronomical studies of the hydroxyl radical is presented as an aid to workers in both fields.

ISSN:0047-2689    

DOI:10.1063/1.555570

出版商:AIP    

年代:1978

数据来源: AIP

摘要:

The thermodynamic properties (H0−H00, (G0−H00)/T, (H0−H00)/T,S0,Cp0, &Dgr;Hf0, &Dgr;Gf0, and logKf] for methanoic (formic) and ethanoic (acetic) acid monomers and dimers in the ideal gaseous state over the temperature range from 0 to 1500 K and 1 atm have been calculated by the statistical thermodynamic method using the most recent and reliable molecular and spectroscopic constants. The internal rotational contributions of −OH and −CH3rotors to the thermodynamic properties were evaluated based on internal rotation partition functions formed by summation of calculated internal rotation energy levels. On an assumption that the vapor contains only monomers and dimers, the thermodynamic properties for the monomer‐dimer equilibrium mixture of methanoic and ethanoic acids in ideal gaseous state were derived. The results are in agreement with available experimental data.

ISSN:0047-2689    

DOI:10.1063/1.555571

出版商:AIP    

年代:1978

数据来源: AIP