dorsal/arxiv
View SchemaCollisional broadening of alkali doublets by helium perturbers
| Authors | D. F. T. Mullamphy, G. Peach, V. Venturi, I. B. Whittingham, S. J. Gibson |
|---|---|
| Categories | |
| ArXiv ID | physics/0609251 |
| URL | https://arxiv.org/abs/physics/0609251 |
| DOI | 10.1088/0953-4075/40/6/005 |
Abstract
We report results for the Lorentzian profiles of the Li I, Na I and K I doublets and the Na I subordinate doublet broadened by helium perturbers for temperatures up to 3000 K They have been obtained from a fully quantum-mechanical close-coupling description of the colliding atoms, the Baranger theory of line shapes and new ab initio potentials for the alkali-helium interaction. For all lines except the 769.9 nm K I line, the temperature dependence of the widths over the range 70 < T < 3000 K is accurately represented by the power law form w=aT^b with 0.37 < b < 0.43. The 769.9 K I line has this form for 500 < T < 3000 K with b = 0.49. Although the shifts have a more complex temperature dependence, they all have the general feature of increasing with temperature above T=500 K apart from the 769.9 K I line whose shift decreases with temperature.
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"abstract": "We report results for the Lorentzian profiles of the Li I, Na I and K I\ndoublets and the Na I subordinate doublet broadened by helium perturbers for\ntemperatures up to 3000 K They have been obtained from a fully\nquantum-mechanical close-coupling description of the colliding atoms, the\nBaranger theory of line shapes and new ab initio potentials for the\nalkali-helium interaction. For all lines except the 769.9 nm K I line, the\ntemperature dependence of the widths over the range 70 \u003c T \u003c 3000 K is\naccurately represented by the power law form w=aT^b with 0.37 \u003c b \u003c 0.43. The\n769.9 K I line has this form for 500 \u003c T \u003c 3000 K with b = 0.49. Although the\nshifts have a more complex temperature dependence, they all have the general\nfeature of increasing with temperature above T=500 K apart from the 769.9 K I\nline whose shift decreases with temperature.",
"arxiv_id": "physics/0609251",
"authors": [
"D. F. T. Mullamphy",
"G. Peach",
"V. Venturi",
"I. B. Whittingham",
"S. J. Gibson"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1088/0953-4075/40/6/005",
"title": "Collisional broadening of alkali doublets by helium perturbers",
"url": "https://arxiv.org/abs/physics/0609251"
},
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