Vibrational relaxation of N+2(X2Σ+g, ν=1) in collisions with He is studied by means of both the quasiclassical trajectory moment method and a semiclasssical analytical approach. To carry out trajectory calculations the potential‐energy surface of N+2–He is modeled using abinitio data. Rate constants k10(T) calculated by the moment method reproduce the plateau‐like behavior in the Landau–Teller plot of the experimental values at the near thermal energy limit. Simpler analytical models allowing for the long‐range interaction are also used to estimate k10(T). The presented theoretical results are in good qualitative agreement with experimental data.

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