Fig. 1
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Jacobi coordinates defining the geometry of the CH3CCH-He van der Waals complex. The origin of the reference frame is at the CH3CCH center-of-mass. The angles are defined so that for θ = 0°, He approaches along the C-H end of the molecule and for ϕ = 60°, the He atom lies in the plane defined by CHCH atoms on the side of the H atom.
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