Simplified methods for the computation of asymmetric rotor energy levels and line strengths

1958 ◽  
Vol 2 (1-6) ◽  
pp. 259-272 ◽  
Author(s):  
Edwin K. Gora
Keyword(s):  
Energy Levels ◽  
Asymmetric Rotor ◽  
Line Strengths

Spectra, energy levels, and transition line strengths forSm3+:Y3Al5O12

1999 ◽  
Vol 60 (23) ◽  
pp. 15643-15653 ◽  
Author(s):  
John B. Gruber ◽  
Bahram Zandi ◽  
Michael F. Reid
Keyword(s):  
Energy Levels ◽  
Transition Line ◽  
Line Strengths

The effect of configuration interaction on forbidden line strengths

1956 ◽  
Vol 52 (1) ◽  
pp. 107-113 ◽  
Author(s):  
R. H. Garstang
Keyword(s):  
Configuration Interaction ◽  
Major Part ◽  
Energy Levels ◽  
Line Strength ◽  
Line Strengths

ABSTRACTThe calculation of the strengths of forbidden lines in the 1s22s22p2 configuration is extended to include the effect of interaction with the 1s22p4 configuration. For this case it is shown that if observed energy levels are used instead of theoretical energies in line-strength formulae which neglect configuration interaction the major part of the effect of configuration interaction is nevertheless taken into account. The results are illustrated by detailed computations on the Ca xv spectrum. The 1s22s22p4 configuration is also discussed.

Asymmetric rotor energy levels: An improved computational procedure

1960 ◽  
Vol 4 (1-6) ◽  
pp. 342-348 ◽  
Author(s):  
J.M. Bennett ◽  
I.G. Ross ◽  
E.J. Wells
Keyword(s):  
Energy Levels ◽  
Computational Procedure ◽  
Asymmetric Rotor

scholarly journals Benchmarking Current Capabilities for the Generation of Excitation and Photoionisation Atomic Data

Galaxies ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 90 ◽  
Author(s):  
Catherine Ramsbottom ◽  
Connor Ballance ◽  
Ryan Smyth ◽  
Andrew Conroy ◽  
Luis Fernández-Menchero ◽  
...  
Keyword(s):  
Numerical Methods ◽  
Cross Sections ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Radiative Transition ◽  
Atomic Data ◽  
High Quality ◽  
Astronomical Instruments ◽  
First Time ◽  
Line Strengths

The spectra currently emerging from modern ground- and space-based astronomical instruments are of exceptionally high quality and resolution. To meaningfully analyse these spectra, researchers utilise complex modelling codes to replicate the observations. The main inputs to these codes are atomic data such as excitation and photoionisation cross sections, as well as radiative transition probabilities, energy levels, and line strengths. In this publication, the current capabilities of the numerical methods and computer packages used in the generation of these data are discussed. Particular emphasis is given to Fe-peak species and the heavy systems of tungsten and molybdenum. Some of the results presented to highlight certain issues and/or advances have already been published in the literature, while other sections present new recently evaluated atomic data for the first time.

A semiclassical determination of the energy levels of a rigid asymmetric rotor

1978 ◽  
Vol 68 (2) ◽  
pp. 745-749 ◽  
Author(s):  
S. M. Colwell ◽  
N. C. Handy ◽  
W. H. Miller
Keyword(s):  
Energy Levels ◽  
Asymmetric Rotor

Triaxiality in 146,148Sm nuclei

1989 ◽  
Vol 67 (2-3) ◽  
pp. 131-134 ◽  
Author(s):  
A. K. Varshney ◽  
K. K. Gupta ◽  
D. K. Gupta ◽  
R. K. Tyagi
Keyword(s):  
Energy Levels ◽  
Branching Ratios ◽  
Energy Ratio ◽  
Poor Agreement ◽  
Model Framework ◽  
Expansion Technique ◽  
Asymmetric Rotor ◽  
Boson Expansion ◽  
Spherical Nuclei ◽  
Rotor Model

Recently, attempts have been made to use the dynamic pairing plus quadrupole model to evaluate B(E2) values, B(E2) branching ratios, and low-lying energy levels for 146,148Sm nuclei, which are in poor agreement with experiment. Application of the boson expansion technique on 148Sm shows too much splitting and an incorrect order for the quintet states, while other properties have not been discussed. In the present work, 146,148Sm nuclei have been described using an asymmetric rotor model framework. The nonaxiality parameter (γ) has been evaluated using the energy ratio E2+′/E6+. Remarkable success has been achieved in explaining the correct ordering of known low-lying energy levels, B(E2) values, and B(E2) branching ratios, which indicate that the so-called spherical nuclei may be treated as triaxial.

Zur Störung der Rotationsenergie des asymmetrischen Kreisels durch in den Drehimpulskomponenten lineare Glieder, insbesondere bei interner Rotation

1966 ◽  
Vol 21 (6) ◽  
pp. 694-696 ◽  
Author(s):  
Heinz Dieter Rudolph
Keyword(s):  
Angular Momentum ◽  
Fine Structure ◽  
Internal Rotation ◽  
Second Order ◽  
Absorption Lines ◽  
Methyl Groups ◽  
Rigid Rotor ◽  
Asymmetric Rotor ◽  
Line Strengths

Attention is drawn to the fact that perturbing terms to the HAMILTONian of the asymmetric rigid rotor molecule which are linear in the operators of angular momentum components may be evaluated to second order in the asymmetric rotor basis with the help of published line strengths tables. The usefulness is demonstrated by means of an example where the hindering potential for the internal rotation of the two methyl groups in acetone is calculated from a certain splitting in the quartet torsional fine structure of rotational absorption lines.

scholarly journals Transition spectral parameters of In-like Ba, La and Ce ions

2021 ◽  
Author(s):  
Miao Wu ◽  
Zhencen He
Keyword(s):  
Quantum Electrodynamics ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Spectral Parameters ◽  
Hartree Fock ◽  
Experimental Values ◽  
Theoretical Results ◽  
Good Agreement ◽  
Line Strengths

The spectral parameters (energy levels, wavelengths, transition probabilities, line strengths and oscillator strengths) of resonance lines for Ba VIII, La IX and Ce X have been performed using the multiconfiguration Dirac-Hartree-Fock method, the contributions of quantum electrodynamics and Breit interactions correction are taken into considered. The calculated results of energy levels and wavelengths are in good agreement with experimental values and other calculation. The number of energy levels and wavelengths considered is larger than that of any other experiment values and other calculations. The transition probabilities, line strengths and oscillator strengths are also calculated where no other theoretical results and experimental values are available.

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