A quantum mechanical view of molecular alignment and cooling in seeded supersonic expansions
| Autor: | David Cappelletti, Vincenzo Aquilanti, Daniela Ascenzi, M. de Castro Vítores, Fernando Pirani |
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| Rok vydání: | 1999 |
| Předmět: |
Physics
General Physics and Astronomy Rotational transition molecular alignment supersonic seeded beams Inelastic scattering Azimuthal quantum number Total angular momentum quantum number Angular momentum coupling Orbital motion Angular momentum of light Orbital angular momentum of light Physical and Theoretical Chemistry Atomic physics |
| Zdroj: | The Journal of Chemical Physics. 111:2620-2632 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.479537 |
| Popis: | Experimental investigations on the collisional alignment of the rotational angular momentum, occurring in supersonic seeded beams and in drift tubes, have recently documented a strong dependence of the observed effects on the final molecular velocity. The present investigation aims at elucidating the possible mechanisms at the molecular collision level. Quantum state-to-state differential scattering cross sections, calculated for the prototype system O2–He, for an interaction potential previously obtained in this laboratory, exhibit propensities relevant to reveal nature and selective role of the elastic and inelastic scattering events, participating in the overall mechanisms which lead to molecular alignment and cooling. The present analysis shows that the dynamics of such phenomena crucially depends on the initial and final rotational state, on the collision energy, on the involved orbital angular momentum and therefore alternative routes are possible for molecular polarization and relaxation. These rou... |
| Databáze: | OpenAIRE |
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