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Elastic scattering of two ground-state N atoms |
| Zhang Xiao-Niu(张小妞), Shi De-Heng(施德恒)†, Sun Jin-Feng(孙金锋), and Zhu Zun-Lue(朱遵略) |
| College of Physics and Information Engineering, Henan Normal University, Xinxiang 453007, China |
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Abstract An interaction potential for an N2(X1$\sigma_{\rm g}^+$) molecule is constructed by using the highly accurate valence internally contracted multireference configuration interaction method and the largest basis set, aug-cc-pV6Z, in the valence range. The potential is used to investigate the elastic scattering of two N atoms at energies from 1.0× 10-11 to 1.0× 10-4 a.u. The derived total elastic cross sections are very large and almost constant at ultralow temperatures, and the shape of total elastic cross section curve is mainly dominated by the s-partial wave at very low collision energies. Three shape resonances are found in the total elastic cross sections. Concretely, the first one is very sharp and strong. It results from the g-partial-wave contribution and the resonant energy is 3.645× 10-6 a.u. The second one is contributed by the h-partial wave and the resonant energy is 1.752× 10-5 a.u. This resonance is broadened by those from the d- and f-partial waves. The third one comes from the l = 6 partial wave contribution and the resonant energy is 3.522× 10-5 a.u. This resonance is broadened by those from the g- and h-partial waves. The N2(X1$\sigma_{\rm g}^+$) molecular parameters, which are determined at the current theoretical level, achieve very high accuracy due to the employment of the largest correlation-consistent basis set in the valence range.
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Received: 04 June 2009
Revised: 23 June 2009
Accepted manuscript online:
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PACS:
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34.50.-s
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(Scattering of atoms and molecules)
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31.15.vn
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(Electron correlation calculations for diatomic molecules)
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33.15.Mt
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(Rotation, vibration, and vibration-rotation constants)
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33.20.Tp
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(Vibrational analysis)
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| Fund: Project supported by the Program
for Science and Technology Innovation Talents in Universities of
Henan Province, China (Grant No. 2008HASTIT008), and the National
Natural Science Foundation of China (Grant Nos. 60777012 and
10874064). |
Cite this article:
Zhang Xiao-Niu(张小妞), Shi De-Heng(施德恒), Sun Jin-Feng(孙金锋), and Zhu Zun-Lue(朱遵略) Elastic scattering of two ground-state N atoms 2010 Chin. Phys. B 19 013501
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