Inelastic Scattering of CO with He: Polarization Dependent Differential State-to-State Cross Sections

摘要: A joint theoretical and experimental study of state-to-state rotationally inelastic polarization dependent differential cross sections (PDDCSs) for CO (v = 0, j 1, 2) molecules colliding with helium is reported collision energies 513 840 cm(-1). In a crossed molecular beam experiment, velocity map imaging (VMI) state-selective detection by (2 + 1) (1 1') resonance enhanced multiphoton ionization (REMPI) used to probe rotational excitation due scattering. By taking account the known fractions 2 states in cold (Trot ≈ 3 K), close-coupling theory based on high-quality ab initio potential energy surfaces CO-He interaction simulate mixed initial states. With polarization-sensitive 1 1' REMPI direct analysis procedure described Suits et al. ( J. Phys, Chem. 2015 , 119 5925 ), alignment moments are extracted from images latter compared simulated using calculated DCS moments. general, good agreement results found, indicating reliability experiment reproducing polarization-dependent sections.