dorsal/arxiv
View SchemaPhotoassociation spectroscopy of cold alkaline earth atoms near the intercombination line
| Authors | R. Ciurylo, E. Tiesinga, S. Kotochigova, P. S. Julienne |
|---|---|
| Categories | |
| ArXiv ID | physics/0407109 |
| URL | https://arxiv.org/abs/physics/0407109 |
| DOI | 10.1103/PhysRevA.70.062710 |
Abstract
The properties of photoassociation (PA) spectra near the intercombination line (the weak transition between $^{1}S_{0}$ and $^{3}P_{1}$ states) of group II atoms are theoretically investigated. As an example we have carried out a calculation for Calcium atoms colliding at ultra low temperatures of 1 mK, 1 $\mu$K, and 1 nK. Unlike in most current photoassociation spectroscopy the Doppler effect can significantly affect the shape of the investigated lines. Spectra are obtained using Ca--Ca and Ca--Ca$^*$ short-range {\it ab initio} potentials and long-range van der Waals and resonance dipole potentials. The similar van der Waals coefficients of ground $^{1}S_{0} + ^{1}S_{0}$ and excited $^{1}S_{0} + ^{3}P_{1}$ states cause the PA to differ greatly from those of strong, allowed transitions with resonant dipole interactions. The density of spectral lines is lower, the Condon points are at relatively short range, and the reflection approximation for the Franck-Condon factors is not applicable, and the spontaneous decay to bound ground-state molecules is efficient. Finally, the possibility of efficient production of cold molecules is discussed.
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"abstract": "The properties of photoassociation (PA) spectra near the intercombination\nline (the weak transition between $^{1}S_{0}$ and $^{3}P_{1}$ states) of group\nII atoms are theoretically investigated. As an example we have carried out a\ncalculation for Calcium atoms colliding at ultra low temperatures of 1 mK, 1\n$\\mu$K, and 1 nK. Unlike in most current photoassociation spectroscopy the\nDoppler effect can significantly affect the shape of the investigated lines.\nSpectra are obtained using Ca--Ca and Ca--Ca$^*$ short-range {\\it ab initio}\npotentials and long-range van der Waals and resonance dipole potentials. The\nsimilar van der Waals coefficients of ground $^{1}S_{0} + ^{1}S_{0}$ and\nexcited $^{1}S_{0} + ^{3}P_{1}$ states cause the PA to differ greatly from\nthose of strong, allowed transitions with resonant dipole interactions. The\ndensity of spectral lines is lower, the Condon points are at relatively short\nrange, and the reflection approximation for the Franck-Condon factors is not\napplicable, and the spontaneous decay to bound ground-state molecules is\nefficient. Finally, the possibility of efficient production of cold molecules\nis discussed.",
"arxiv_id": "physics/0407109",
"authors": [
"R. Ciurylo",
"E. Tiesinga",
"S. Kotochigova",
"P. S. Julienne"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.70.062710",
"title": "Photoassociation spectroscopy of cold alkaline earth atoms near the intercombination line",
"url": "https://arxiv.org/abs/physics/0407109"
},
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