Results 301 to 310 of about 71,129 (328)
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Optical phonons with a negative oscillator strength
Physics-Uspekhi, 2020Abstract We discuss the nature of additional (redundant from the point of view of selection rules) optical phonons observed in most crystals with ion–covalent bonds between atoms, including in their solid solutions.
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Oscillator strengths for XeII transitions
Journal of Molecular Structure: THEOCHEM, 1990Abstract We present oscillator-strength calculations for single-ionized xenon transitions and the results are compared with other theoretical and experimental values.
D. Iriarte +4 more
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Collision strengths and oscillator strengths for Fe IX
Atomic Data and Nuclear Data Tables, 1991Abstract Collision strengths and oscillator strengths are calculated for Fe IX. The three configurations 3 s 2 3 p 6 , 3 s 2 3 p 5 3 d , and 3 s 2 3 p 5 4 s were included in the computations. The data can be applied to the analysis of spectral lines in the solar spectrum and laboratory sources. The collision calculations were executed with the
B.C. Fawcett, H.E. Mason
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Experimental oscillator strengths in NeVII
Physics Letters A, 1972Abstract Mean life measurements have been made for the 2s2p 1 P° level in NeVII, as well as for the doubly excited parent level, 2p 2 1 D.
G. Beauchemin +4 more
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Oscillator strengths in tetrahedral semiconductors
Physical Review B, 1976Values of the optical matrix elements are estimated from experimental values of the dielectric constant and the energy of the optical reflectivity peak. The matrix elements of the momentum operator are found independent of polarity, as in studies by Lawaetz and by Cohen.
Walter A. Harrison +1 more
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H2 Lyman-Band Oscillator Strengths
The Journal of Chemical Physics, 1968Absorption oscillator strengths for thirty rotational lines in nine vibrational bands of the Lyman transition, B 1Σu+, of H2 have been obtained from equivalent widths measured photoelectrically under high resolution. Argon and helium continua were used in the third and first orders, respectively, of the grating.
James E. Hesser +2 more
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Oscillator strengths for neutral technetium
Publications of the Astronomical Society of the Pacific, 1981Oscillator strengths are calculated for lines in the spectrum of neutral technetium which may be of importance in the study of stellar spectra. The calculations were performed by the setting up and diagonalization of the energy matrices of the 4d56S5s5p and 4d65D5p partial configurations for the 37 classified energy levels of odd parity arising from ...
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Optical oscillator strengths for lithium
International Journal of Quantum Chemistry, 1980AbstractA simple two‐parameter analytic potential adjusted so as to reproduce the experimental energy levels is used to generate wave functions for the ground and excited states of the lithium atom. Using these wave functions in conjunction with the Born approximation and the Russell–Saunders LS‐coupling scheme, we calculate the optical oscillator ...
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Oscillator Strengths and Transition Probabilities
1997The radiative characteristics of atoms and ions such as oscillator strengths, transition probabilities, lifetimes of excited states and others required for fundamental research and physical applications are considered here. The last Section comprises the data on the angular coefficients used for the calculation of oscillator strengths and excitation ...
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Optical oscillator strengths for neon
Journal of Quantitative Spectroscopy and Radiative Transfer, 1978Abstract An analytic atomic independent particle model is used to calculate optical oscillator strengths for 2 p-ns and 2 p-nd transitions in neon. Impressive agreements are obtained with the results of Hartree-Fock-Slater calculations and experiment.
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