scholarly journals CaH Rydberg series, oscillator strengths and photoionization cross sections from Molecular Quantum Defect and Dyson Orbital theories

2017 ◽  
Vol 187 ◽  
pp. 161-166 ◽  
Author(s):  
A.M. Velasco ◽  
C. Lavín ◽  
Manuel Díaz-Tinoco ◽  
J.V. Ortiz
Keyword(s):  
Cross Sections ◽  
Quantum Defect ◽  
Oscillator Strengths ◽  
Rydberg Series

Excitation Energies and Photoabsorption Oscillator Strengths of the Rydberg Series in CF3Cl. A Linear Response and Quantum Defect Study

2007 ◽  
Vol 111 (17) ◽  
pp. 3321-3325 ◽  
Author(s):  
J. Pitarch-Ruiz ◽  
A. Sánchez de Merás ◽  
J. Sánchez-Marín ◽  
E. Mayor ◽  
A. M. Velasco ◽  
...  
Keyword(s):  
Linear Response ◽  
Quantum Defect ◽  
Oscillator Strengths ◽  
Rydberg Series ◽  
Excitation Energies

Quantum defect orbital calculations on the alkaline-earth elements: oscillator strengths and photoionization cross sections

1985 ◽  
Vol 63 (11) ◽  
pp. 1441-1445 ◽  
Author(s):  
Carmen Barrientos ◽  
Inmaculada Martin
Keyword(s):  
Cross Sections ◽  
Alkaline Earth ◽  
Experimental Results ◽  
Quantum Defect ◽  
Oscillator Strengths ◽  
Alkaline Earth Elements ◽  
Experimental Values

The quantum defect orbital (QDO) formalism is applied to the computation of oscillator strengths of Mg, Ca, Sr, and Ba and photoionization cross sections of Mg and Ca. For [Formula: see text] transitions, QDO oscillator strengths reproduce fairly well the experimental values both in magnitude and trend. Photoionization cross sections for ns2 → nsεp transitions agree well with experimental results where no autoionization resonances are present. The results of both sets of calculations are at least comparable in quality to those of other more complex procedures.

scholarly journals Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV)

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 27
Author(s):  
Jean-Paul Mosnier ◽  
Eugene T. Kennedy ◽  
Jean-Marc Bizau ◽  
Denis Cubaynes ◽  
Ségolène Guilbaud ◽  
...  
Keyword(s):  
High Resolution ◽  
Cross Section ◽  
Cross Sections ◽  
Experimental Studies ◽  
Photoionization Cross Section ◽  
Theoretical Work ◽  
Rydberg Series ◽  
R Matrix ◽  
Resonance Strengths ◽  
Nitrogen Ion

High-resolution K-shell photoionization cross-sections for the C-like atomic nitrogen ion (N+) are reported in the 398 eV (31.15 Å) to 450 eV (27.55 Å) energy (wavelength) range. The results were obtained from absolute ion-yield measurements using the SOLEIL synchrotron radiation facility for spectral bandpasses of 65 meV or 250 meV. In the photon energy region 398–403 eV, 1s⟶2p autoionizing resonance states dominated the cross section spectrum. Analyses of the experimental profiles yielded resonance strengths and Auger widths. In the 415–440 eV photon region 1s⟶(1s2s22p2 4P)np and 1s⟶(1s2s22p2 2P)np resonances forming well-developed Rydberg series up n=7 and n=8 , respectively, were identified in both the single and double ionization spectra. Theoretical photoionization cross-section calculations, performed using the R-matrix plus pseudo-states (RMPS) method and the multiconfiguration Dirac-Fock (MCDF) approach were bench marked against these high-resolution experimental results. Comparison of the state-of-the-art theoretical work with the experimental studies allowed the identification of new resonance features. Resonance strengths, energies and Auger widths (where available) are compared quantitatively with the theoretical values. Contributions from excited metastable states of the N+ ions were carefully considered throughout.

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.

Sign in / Sign up

Export Citation Format

Share Document