Ozone: Unresolved discrepancies for dipole oscillator strength distributions, dipole sums, and van der Waals coefficients

2011 ◽  
Vol 135 (7) ◽  
pp. 074303 ◽  
Author(s):  
Ashok Kumar ◽  
Ajit J. Thakkar
Keyword(s):  
Oscillator Strength ◽  
Van Der Waals ◽  
Dipole Oscillator ◽  
Dipole Sums ◽  
Strength Distributions

Dipole oscillator strength distributions, sums, and some related properties for Li, N, O, H2, N2, O2, NH3, H2O, NO, and N2O

1977 ◽  
Vol 55 (23) ◽  
pp. 2080-2100 ◽  
Author(s):  
G. D. Zeiss ◽  
William J. Meath ◽  
J. C. F. MacDonald ◽  
D. J. Dawson
Keyword(s):  
Oscillator Strength ◽  
Cross Sections ◽  
High Energy ◽  
High Energy Electron ◽  
Sum Rule ◽  
Dipole Oscillator ◽  
Scattering Cross Sections ◽  
Additional Constraints ◽  
Dipole Sums ◽  
Strength Distributions

Dipole oscillator strength distributions (DOSDs) have been constructed for ground state Li, N, O, H2, N2, O2, NH3, H2O, NO, and N2O by using experimental and theoretical photoabsoiption and high energy electron inelastic scattering cross sections. Each DOSD is required to satisfy the Thomas–Reiche–Kuhn sum rule and additional constraints derived from available accurate experimental refractivity and dispersion measurements. The DOSDs, the data and procedure used to construct the DOSDs, and the values of the dipole oscillator strength sums Sk and Lk (for a variety of k values) and related atomic and molecular properties obtained from the DOSDs are reported. The discussion includes comments regarding the importance of the constraints imposed on the DOSD with respect to the evaluation of various dipole sums and properties and the accuracy of the results.

Dipole oscillator strength properties and dispersion energy coefficients for H2S

1988 ◽  
Vol 66 (4) ◽  
pp. 615-619 ◽  
Author(s):  
R. J. Pazur ◽  
Ashok Kumar ◽  
R. A. Thuraisingham ◽  
William J. Meath
Keyword(s):  
Oscillator Strength ◽  
Ground State ◽  
Strength Properties ◽  
Physical Processes ◽  
Dispersion Energy ◽  
Excitation Energies ◽  
Dipole Oscillator ◽  
Energy Coefficient ◽  
Dipole Sums ◽  
Strength Distributions

Globally reliable dipole oscillator strength distributions (DOSDs) have been constructed for the H2S molecule in its ground state. An adopted DOSD is used to evaluate a variety of dipole oscillator strength sums Sk, logarithmic dipole sums Lk, and mean excitation energies Ik, for H2S; these dipole properties are important in various physical processes. It is also used to obtain reliable results for the dipole–dipole dispersion energy coefficients C6 for the interaction of H2S with itself, and with thirty-nine other atoms and (mostly) molecules, and the triple-dipole dispersion energy coefficient C9 for (H2S)3. A pseudo-DOSD for H2S is presented which facilitates the evaluation of C6's, and in particular C9's.

Dipole oscillator strength distributions and properties for SO2, CS2, and OCS

1985 ◽  
Vol 63 (3) ◽  
pp. 417-427 ◽  
Author(s):  
Ashok Kumar ◽  
William J. Meath
Keyword(s):  
Oscillator Strength ◽  
Cross Sections ◽  
Ground State ◽  
Strength Properties ◽  
Oscillator Strengths ◽  
Sum Rule ◽  
Strength Data ◽  
Dilute Gases ◽  
Dipole Oscillator ◽  
Strength Distributions

Dipole oscillator strength distributions have been constructed and used to evaluate integrated oscillator strengths, and a variety of dipole oscillator strength properties, for ground state SO2, CS2, and OCS. Each distribution has been constructed by using experimental and theoretical photoabsorption cross sections and by subjecting the resulting dipole oscillator strength data to constraints provided by the Thomas–Reiche–Kuhn sum rule and molar refractivity data for the relevant dilute gases. The discussion includes graphical presentations of how various spectral regions of the dipole oscillator strength distributions contribute to the more important dipole properties.

Dipole oscillator strength distributions and related properties for ethylene, propene and 1-butene

1983 ◽  
Vol 61 (7) ◽  
pp. 1027-1034 ◽  
Author(s):  
B. L. Jhanwar ◽  
William J. Meath ◽  
J. C. F. MacDonald
Keyword(s):  
Oscillator Strength ◽  
Cross Sections ◽  
Ground State ◽  
Oscillator Strengths ◽  
Detailed Model ◽  
Sum Rule ◽  
Strength Data ◽  
Dilute Gases ◽  
Dipole Oscillator ◽  
Strength Distributions

Dipole oscillator strength distributions (DOSDs) have been constructed for ground state ethylene, propene, and 1-butene. Each DOSD is constructed by using available experimental and theoretical photoabsorption cross sections and by constraining the resulting dipole oscillator strength data to satisfy the Thomas – Reiche–Kuhn sum rule and molar refractivity constraints. The latter were obtained from experimental refractive index measurements of relevant dilute gases. The recommended DOSDs, and the values of integrated "band" oscillator strengths, and the dipole oscillator strength sums Sk and Lk (for a variety of k values) obtained from them, are reported. The discussion includes an analysis of the reliability of the results using 1-butene as a detailed model.

Dipole oscillator strength distributions and properties for methanol, ethanol, and n-propanol

1984 ◽  
Vol 62 (2) ◽  
pp. 373-381 ◽  
Author(s):  
B. L. Jhanwar ◽  
William J. Meath
Keyword(s):  
Oscillator Strength ◽  
Cross Sections ◽  
Ground State ◽  
Oscillator Strengths ◽  
Sum Rule ◽  
Strength Data ◽  
Molar Refractivity ◽  
Dipole Oscillator ◽  
Strength Distributions

Dipole oscillator strength distributions (DOSDs) have been constructed for ground state methanol, ethanol, and n-propanol and used to evaluate integrated ("band") oscillator strengths and the dipole oscillator strength sums Sk and Lk (for a variety of k values) for these molecules. Each DOSD is constructed by using available experimental and theoretical photoabsorption cross sections and by constraining the resulting dipole oscillator strength data to satisfy the Thomas–Reiche–Kuhn sum rule and molar refractivity constraints. The discussion includes an analysis of the reliability of the results.

Valence shell absolute photoabsorption oscillator strengths, constrained dipole oscillator strength distributions, and dipole properties for CH3NH2, (CH3)2NH, and (CH3)3N

1994 ◽  
Vol 72 (3) ◽  
pp. 529-546 ◽  
Author(s):  
Gordon R. Burton ◽  
Wing Fat Chan ◽  
Glyn Cooper ◽  
C.E. Brion ◽  
Ashok Kumar ◽  
...  
Keyword(s):  
Oscillator Strength ◽  
Cross Sections ◽  
Oscillator Strengths ◽  
Valence Shell ◽  
Reliable Determination ◽  
Sum Rule ◽  
Wide Range ◽  
Dipole Oscillator ◽  
Strength Distributions

Dipole (e,e) spectroscopy has been used to measure the absolute photoabsorption oscillator strengths (cross sections) for the valence shells of CH3NH2, (CH3)2NH, and (CH3)3N from the photoabsorption threshold to 250 eV at low resolution (∼1 eV fwhm) and to 31 eV at high resolution (0.048 eV fwhm). The observed peaks in the photoabsorption spectra of the methylamines have been assigned to transitions to Rydberg orbital upper states. Our measured photoabsorption data, augmented by mixture rule estimates for high photon energies, have been used in conjunction with Thomas–Reiche–Kuhn sum rule and molar refractivity constraints, to construct constrained dipole oscillator strength distributions for each of the methylamines. From these constrained dipole oscillator strength distributions a wide range of related dipole properties have been calculated for each of the methylamines, and in most cases the results so obtained represent the first (reliable) determination of these properties.

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