Dispersion coefficients for alkali-metal diatoms
Journal Article
·
· Bulletin of the American Physical Society
OSTI ID:281226
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
The knowledge of the long-range interaction between atoms and molecules is of fundamental importance for low-energy and low-temperature collisions. The electrostatic interaction between the charge distributions of two ground-state alkali-metal atoms can be expanded in powers of 1/R, the internuclear distance. The coefficients corresponding to the expansion powers of R{sup -6}, R{sup -8}, and R{sup -10} are calculated exactly using a numerical technique originally developed for determining resonance profile near an absorption line. These coefficients are evaluated by integrating the dynamic electric multipole polarizabilities at imaginary frequencies which are in turn obtained by solving two coupled inhomogeneous differential equations. Highly accurate one-electron model potentials are developed to represent the motion of the valence electron in the field of the closed alkali positive ion core. The numerical results for the constants C{sub 6}, C{sub 8}, and C{sub 10} for the homo- and hetero-nuclear alkai diatoms are compared with other calculations.
- OSTI ID:
- 281226
- Report Number(s):
- CONF-9305421--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
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