A global adiabatic potential energy surface (PES) corresponding to the second singlet state 1 1A" (1 1B1) of CH2 has been computed in a similar way as the first singlet state 1 1A' in our previous work [B. Bussery-Honvault et al., J. Chem. Phys., 2001, 115, 10 701]. This PES has a calculated well depth of 79.9 kcal mol(-1) relative to the C(1D) + H2 asymptote and correlates to CH(2pi) + H. It presents large barriers in the C(1D) + H2 arrangement for both collinear and perpendicular geometries but no barrier for geometries about 60 degrees and leads to a sideways insertion mechanism for the reaction C(1D) + H2 --> CH(2pi) + H. The ab initio calculations were carried out for 4644 geometries and the resulting energies were fitted to a many-body expansion. Accurate three-dimensional quantum mechanical scattering calculations have been performed for the C(1D) + H2(v = 0, j = 0) reaction on this ab initio 1 1A" PES in the collision energy range [0-11.5 kcal mol(-1)]. The J = 0 reaction probabilities show dense resonance structures as those obtained with the 1 1A' PES. However some different dynamical features have been found.

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Using the short pulses of a linac a measurement has been performed of partial p, -capture rates in ' 0 leading to the 0 and 1 bound excited states of ' 'N. The experimental 0+~0 transition rate supports the assumption of a large mesonic exchange effect in the time part of the weak axial current.NUCLEAR HEACTIONS Muon capture 60( p, p)~6N. Measured I", Ge{Li) detec:tor. Deduced partial capture rates. Mesonic exchange correction to capture rate calculations.

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