Temperature dependence of spectral lineshifts in pressure broadening

Kreye, W. C.; Kielkopf, John F.

doi:10.1088/0953-4075/24/1/010

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…The essential features of our method are described by Allard and Kielkopf (1982) and by Kreye and Kielkopf (1991). Results for several alkali-noble gas pairs will be presented elsewhere.…”

Section: Potentialsmentioning

confidence: 99%

“…Recently, Kreye and Kielkopf (1991) performed adiabatic computations of the spectral lineshift for the K 7s 2 S 1/2 → 4p 2 P 3/2 transition perturbed by Ar (λ = 5802 Å). In order to assess the importance of the non-adiabatic effects, the present quantum mechanical study of the non-adiabatic shifts and widths has been implemented.…”

Section: Introductionmentioning

confidence: 99%

“…Leo et al (1995a, b) have also employed coupled Schrödinger radial equations in their studies of self-broadening of He and Ne, but they have used an R-matrix method for solving the differential equations, and considered an average over perturber velocity. The adiabatic method used by Kreye and Kielkopf (1991) was based on the paper by Szudy and Baylis (1975). An alternative approach to non-adiabatic line profiles in the presence of a radiation field is given by Julienne (1982).…”

Section: Introductionmentioning

confidence: 99%

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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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“…The essential features of our method are described by Allard and Kielkopf (1982) and by Kreye and Kielkopf (1991). Results for several alkali-noble gas pairs will be presented elsewhere.…”

Section: Potentialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Temperature Dependences of the Quantum-Mechanical and Semi-Classical Spectral-Line Widths and the Separation of the Impact and Non-Impact Regions for an Ar-Perturbed/K-Radiator System

Kreye

2010

International Journal of Spectroscopy

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Quantum-mechanical and semi-classical spectral-line shapes are computed at , , and K for the line core of the 5802 Å line of the Ar-Perturbed/K-Radiator system. HWHMs ('s) are measured from computed full spectral-line shapes. The final-state pseudopotential is for the state, and the initial-state potential is for the state. Three high-pressure (P) —versus— curves, corresponding to the non-impact region, intersect a similar set of low-P, impact-region curves at intersections, 's. Similarly, for two sets of —versus— curves, which yield intersections, 's, where is the perturber density. These 's and 's separate the two regions and represent the upper limits of the impact regions. A specific validity condition for the impact region is given by the equation . From an earlier spectroscopic, Fabry-Perot paper, cm−1 at K and torr. Two theoretical values, and cm−1 corresponding to two different pseudo-potentials, are reported. Two -dependent figures are given, in which the first shows an increase in the impact region with , based on as the basic parameter, and the second which shows a decrease in the impact region with , based on as the basic parameter.

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A Computational/Spectroscopic Study of a Newly Derived General Unified Theory of Spectral Line Shapes to Measure HWHM's for an Ar-perturber/K-radiator system, Using Two 74sp← Transitions, as Applied to the Line Core

Kreye¹

2013

TOSPECJ

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In a recent publication, a new unified theory of spectral line shapes was derived, which allowed for the variation of the electric dipole moment with perturber positions. The present author put the () g s term derived from the theory into a computable form, and constructed spectral line shapes from which line-core HWHM's () w s ′ were measured. These w 's were compared with experimental Fabry-Perot-interferometric results.

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Temperature dependence of spectral lineshifts in pressure broadening

Cited by 3 publications

References 19 publications

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

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

Temperature Dependences of the Quantum-Mechanical and Semi-Classical Spectral-Line Widths and the Separation of the Impact and Non-Impact Regions for an Ar-Perturbed/K-Radiator System

A Computational/Spectroscopic Study of a Newly Derived General Unified Theory of Spectral Line Shapes to Measure HWHM's for an Ar-perturber/K-radiator system, Using Two 74sp← Transitions, as Applied to the Line Core

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