An experiment is described in which 10~8 CaH molecules have been confined in a magnetic trap at a temperature of 400 Mk. The elastic scattering cross section of CaH on ~3He was measured to be σ_(el) (1.5 +-0.6) x 10~(―14) cm~2. A lower bound of Γ_(rotatinal) ≥ 10~(―15) cm~3s~(―1) was placed on the rotational elastic collision rate coefficient, and an upper bound of Γ_v < 10~(―16) cm~3 s~(―1) was placed on the vibrational relaxation rate coefficient. The rate coefficient for spin changing collisions was measured to be, within an order magnitude. Γ_Z = 10~(―17) cm~3 s~(―1).
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