The effect of rare-gas collisions on the wings of the potassium 4p2P3/2-7s2S1/2(5802 Å) transition

Kielkopf, John F.

doi:10.1088/0022-3700/15/6/017

Cited by 6 publications

(5 citation statements)

References 18 publications

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“….) by Kielkopf (1982) and the theoretical potential (---) of Parcale and Vandeplanque (1974) are also illurtrated.…”

Section: Potentialsmentioning

confidence: 97%

“…In section 11.D.4.e they provided a comparison with some of the data available at that time to show that the potentials for low-lying states were very accurate and yet that the strength of the interaction at long range, for states closer to the ionization limit, was significantly underestimated by theory in comparison to Cs-Xe experiments. More relevant to this paper, the wings of the 7s-4p transition in K were analysed for broadening by all the noble gases (Kielkopf 1982). From the relative frequency of satellites for Kr and Xe perturbers compared with the unperturbed line a potential well was identified in the vicinity of the antinode in the valence-electron wavefunction.…”

Section: Potentialsmentioning

confidence: 99%

“…Here we report quantum mechanical, impact approximation computations of the spectral lineshifts as a function of temperature for the transition from the excited 7s level to the 4p 'P,,, level of potassium perturbed by argon. This study was prompted by the measurements of Kielkopf and Knollenberg (1981) and Kreye (1982) of the broadening and shift at temperatures ranging from 450-760 K, line wing measurements by Kielkopf (1982) and measurements of the 4p-4s resonance line by Lwin and McCartan (1978) and of the next 5p-4s principal series doublet by Spielfiedel ef a/ (1979). Potentials have been deduced by fitting the entire profile with a unified lineshape calculation (Kielkopf 1982) and by fitting the temperature dependence (Kreye 1982).…”

Section: Introductionmentioning

confidence: 99%

“…This study was prompted by the measurements of Kielkopf and Knollenberg (1981) and Kreye (1982) of the broadening and shift at temperatures ranging from 450-760 K, line wing measurements by Kielkopf (1982) and measurements of the 4p-4s resonance line by Lwin and McCartan (1978) and of the next 5p-4s principal series doublet by Spielfiedel ef a/ (1979). Potentials have been deduced by fitting the entire profile with a unified lineshape calculation (Kielkopf 1982) and by fitting the temperature dependence (Kreye 1982). One purpose of this paper is to accurately evaluate the temperature-dependent shift for a theoretical potential with several choices of parameters and to compare the resulting best fit with one derived from the line wing.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of spectral lineshifts in pressure broadening

Kreye

Kielkopf

1991

J. Phys. B: At. Mol. Opt. Phys.

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An exact quantum adiabatic evaluation of the shift of an isolated spectral line is applied IO the potassium 7s-4p transition perturbed by argon. The long-range interaction of excited alkali s1ates with noble gases is computed with a large basis set of unperturbed atomicstates, amultipoleinteraction and a pseudopotential to compare with a measurement of the dependence afthe shift on temperature. The parameters ofthe theoretical pordssiumargon excited-state potential are determined by adjusting the theoretical temperature dependence to fit the observations. Previous pseudopotential models, fitted to ground-state interactions derived from scattering experiments, show weaker long-range interactions than we find. Our conclusions are consistent with independent line wing experiments on this and other alkali-noble-gas systems that reveal significant interactions at long range.

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“….) by Kielkopf (1982) and the theoretical potential (---) of Parcale and Vandeplanque (1974) are also illurtrated.…”

Section: Potentialsmentioning

confidence: 97%

Section: Potentialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temperature dependence of spectral lineshifts in pressure broadening

Kreye

Kielkopf

1991

J. Phys. B: At. Mol. Opt. Phys.

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“…The two shallow wells are due to oscillations in the 7s radial wavefunction, rather than an interaction with nearby states. This shallow long-range potential has been explored experimentally by studying the non-Lorentzian wing and satellites of this same transition at higher foreign gas densities (Kielkopf 1982).…”

Section: Potentialsmentioning

confidence: 99%

Non-adiabatic effects in the broadening and shift of the K 7s - 4p transition by Ar

Kreye

Kielkopf

1997

J. Phys. B: At. Mol. Opt. Phys.

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This paper reports the use of a quantum theory of spectral line broadening and a realistic model potential to investigate non-adiabatic and inelastic excited state atomic collisions. The fully quantum mechanical lineshifts and widths are computed for the transition perturbed by Ar, using non-adiabatic theory. The effects of the j degeneracy and inelastic collisions for the transition are included and many validity tests are performed. Two-parameter pseudopotentials are used, for which , the radius about the Ar atom, and , the electron density (which is assumed constant within ) are adjustable. These parameters are varied to fit the computed shifts and widths to the experimental values over a range from 443 to 760 K. The contributions to the width and shift from the 7s state are larger than from the 4p state because of a shallow well in the 7s potential around 12.5 Å. The contribution of the non-adiabatic and inelastic terms to the width are small, although they increase with temperature and there are no inelastic contributions to the lineshift.

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