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The elastic scattering of two hydrogen atoms interacting at very small energies is explored numerically using the most accurate potential-energy curves available for the X ¹Σg⁺ and ³Σᵤ⁺ states of H₂. The scattering lengths and low-temperature-averaged cross sections are determined and compared with previous calculations. The scattering lengths are 0.41a₀ for the singlet case and 1.91a₀ for the triplet. The predicted total triplet cross section at 2 K is 5.5×{}10^-15 cm² but it could be lower, at 4.8×{}10^-15 cm², with a different fit to the triplet potential between 12a₀ and 15a₀. A more accurate triplet-state potential is needed at these separations.
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Jamieson et al. (1992) studied this question.
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