Investigation of the B2Σ and test of the A2II interaction potential for Na(32P)-Ar from high-resolution differential scattering measurements |
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Authors: | F Van den Berg R Morgenstern CThJ Alkemade |
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Institution: | Fysisch Laboratorium, Rijksuniversiteit Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands |
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Abstract: | We have measured differential cross sections for scattering of laser-excited Na(32P) by Ar(1S0) at thermal collision energies with high angular resolution (0.1°). In the investigated range of scattering angles (1°–15°) the cross sections contain contributions from scattering along the excited state B2Σ potential (rainbow scattering) and the A2II potential (supernumerary rainbows). By performing fit calculations in which the spectroscopically determined A2II potential was adopted we were able to obtain information about the B2Σ potential. With the assumption of a Lennard-Jones (12.6) potential shape we obtain a well depth ?BΣ = (0.14±0.02)×10?3 au and an equilibrium distance rmBΣ = 10.4±1.0 au. This work presents the first experimental determination of the B2Σ potential well parameters. |
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