Electronic spectrum of crystalline antimony.
Energy levels and interband oscillator strengths of antimony calculated in Brillouin zone by pseudopotential method, predicting polarization effects and spin-orbit splittings
BRILLOUIN ZONE↗
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Results for “OSCILLATOR STRENGTHS”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Semi-empirical cross sections for electron impacts.
Semiempirical electron impact cross sections for He from oscillator strengths, using Born approximation
BORN APPROXIMATION↗
Fe 1, Cr 1 and Cr 2 gf-values from shock-tube measurements
Fe and Cr oscillator strength and statistical population factors measured by absorption technique from shock heated gas
Huber, M.↗
Absolute transition probabilities in ultraviolet molecular spectra.
Radiative lifetimes, transition moments, oscillator strengths and excitation probabilities for H molecule, 13, 14, 15 and 22 electron diatmoic molecules and carbon dioxide ion
Hesser, J. E.↗
Yttrium abundance in the sun.
Solar abundance of Y derived from Y II lines by computing transition probabilities and oscillator strength involving several configurations
Aller, L. H.↗
Photo-ionization of the hydrogen molecule.
H molecule photoionization, using one center wave function with polarized orbital approximation to obtain oscillator strengths in 700 to 300 angstrom range
Khare, S. P.↗
Transition probabilities in the spectra of Ne I, Ar I, and Kr I.
Transition probabilities and oscillator strengths in IR and visible spectra of neutral rare gases, using intermediate coupling approximation
Murphy, P. W.↗
Dipole properties of molecular hydrogen.
Molecular hydrogen electron scattering, optical refractivity and molecular anisotropy used to construct model dipole spectrum consistent with oscillator strength rules
Dalgarno, A.↗
The formation of defect centers in MgO
Defect F centers formation in MgO, discussing optical absorption bands, oscillator strengths, luminescence band, impurity centers, etc
Kroes, R. L.↗
Measurement of the Stark broadening of the resonance lines of neutral argon and neon
Neutral Ar and Ne resonance lines Stark broadening constant from Stark width-oscillator strength product
Greig, J. R.↗
Collisional excitation of the highly excited hydrogen atoms in the dipole form of the semiclassical impact parameter and Born approximations
Expressions for the excitation cross section of the highly excited states of the hydrogenlike atoms by fast charged particles have been derived in the dipole approximation of the semiclassical impact parameter and the Born approximations, making use of a formula for the asymptotic expansion of the oscillator strength of the hydrogenlike atoms given by Menzel. When only the leading term in the asymptotic expansion is retained, the expression for the cross section becomes identical to the expression obtained by the method of the classical collision and correspondence principle given by Percival and Richards. Comparisons are made between the Bethe coefficients obtained here and the Bethe coefficients of the Born approximation for transitions where the Born calculation is available. Satisfactory agreement is obtained only for n yields n + 1 transitions, with n the principal quantum number of the excited state.
Omidvar, K.↗
An investigation of satellites to the resonance lines in some hydrogen-like ions
An experimental and theoretical investigation was conducted on the origin of satellite to resonance lines of the hydrogen-like ions of boron, carbon, and nitrogen. A theta pinch was employed with a grazing incidence spectrograph to measure the wavelengths of the satellites. The spectroscopic data also provided an estimate of the satellite/resonance line intensity ratio. Wavelengths of spectral lines due to transition from doubly excited states were calculated by a Hartree-Fock computer program. Wave functions were also calculated and were used to obtain the oscillator strengths of the transitions. Experimental work confirmed that the lines investigated were not satellites but were due to highly ionized argon which was present as an impurity in the filling gas.
Jalufka, N. W.↗
Interpolation constants for calculation of transmittance and rate of dissociation of molecular oxygen in the mesosphere and lower thermosphere
Values of band oscillator strengths and rotational line widths for the Schumann-Runge band system have been used to derive interpolation constants from which the transmittance and rate of dissociation of molecular oxygen can be calculated. These constants, valid for temperatures between 150 and 300 K and for column densities between 1 x 10 to the 17th power/cm sq and 7 x 10 to the 24th power/cm sq, cover the wavelength range 1750 and 2050A.
Hudson, R. D.↗
Opacity probability distribution functions for electronic systems of CN and C2 molecules including their stellar isotopic forms.
The basis and techniques are presented for generating opacity probability distribution functions for the CN molecule (red and violet systems) and the C2 molecule (Swan, Phillips, Ballik-Ramsay systems), two of the more important diatomic molecules in the spectra of carbon stars, with a view to including these distribution functions in equilibrium model atmosphere calculations. Comparisons to the CO molecule are also shown. T he computation of the monochromatic absorption coefficient uses the most recent molecular data with revision of the oscillator strengths for some of the band systems. The total molecular stellar mass absorption coefficient is established through fifteen equations of molecular dissociation equilibrium to relate the distribution functions to each other on a per gram of stellar material basis.
Querci, F.↗
Photoionization and absorption spectrum of formaldehyde in the vacuum ultraviolet.
The measurements have been conducted in the spectral range from 600 to 2000 A. Integrated oscillator strengths were determined for a number of strong Rydberg transitions above 1200 A. From the photoionization curve the first adiabatic ionization potential was found to be 10.87 plus or minus 0.01 eV. As an aid in interpreting the absorption spectrum, theoretical calculations were made using a single-configuration self-consistent field procedure for the Rydberg states and a model which included mixing between the Rydberg and valence states.
Mentall, J. E.↗
Transition moments, Franck-Condon factors, and lifetimes of forbidden transitions - Calculation of the intensity of the Cameron system of CO.
Discussion of the factors affecting the intensity of forbidden transitions in diatomic molecules. It is shown that using Franck-Condon factors to predict relative band intensities is less reliable for forbidden transitions than it is for allowed transitions. The intensity of the 0,0 and 1,0 bands of the a super 3 pi-super 1 sigma Cameron system of CO are calculated using perturbation theory. The intensity arises from spin-orbit mixing of the A super 1 pi state with the a super 3 pi state. From the known spin-orbit coupling constant of the a super 1 pi state and the known intensity of the fourth positive A super 1 pi-super 1 sigma transition, the oscillator strengths of the 0,0 and 1,0 bands are calculated to be 1.63 x 10 to the minus 7th power and 1.99 x 10 to the minus 7th power. Lifetimes of various rotational levels are shown to range from 2.9 to several hundred milliseconds.-
James, T. C.↗
The shock tube in spectroscopy and astrophysics.
The role of shock-tube spectroscopy in laboratory astrophysics is discussed, with special emphasis on the effectiveness of the hook method for quantitative analyses on shock-heated gases in the determination of solar abundances. Oscillator strengths of Fe I obtained by the hook method are compared with f-values which have been measured by different experimental techniques. Although the hook values tend to be somewhat higher, they are in agreement with those obtained by wall-stabilized arc and shock-tube emission, the beamfoil techniques, and delayed coincidence measurements. Examples are given of other applications of shock-tube spectroscopy to solar and astrophysical studies such as comparisons of solar EUV spectra and laboratory observations of neutral iron, once-ionized iron, and the diatomic Fourth Positive system of CO.
Parkinson, W. H.↗
Third-harmonic generation in phase-matched Rb vapor.
The generation of 0.3547-micron radiation was performed by tripling 1.064-micron radiation in a phase-matched mixture of rubidium vapor and xenon. A third-harmonic nonlinear susceptibility in Rb vapor is confirmed. It is about 100,000 times greater than that of He. This large susceptibility is due to the large oscillator strengths and resonant enhancements resulting from Rb transitions in the near infrared, visible, and UV.
Young, J. F.↗