Gilijamse Joop J, Hoekstra Steven, van de Meerakker Sebastiaan Y T, Groenenboom Gerrit C, Meijer Gerard
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
Science. 2006 Sep 15;313(5793):1617-20. doi: 10.1126/science.1131867.
Molecular scattering behavior has generally proven difficult to study at low collision energies. We formed a molecular beam of OH radicals with a narrow velocity distribution and a tunable absolute velocity by passing the beam through a Stark decelerator. The transition probabilities for inelastic scattering of the OH radicals with Xe atoms were measured as a function of the collision energy in the range of 50 to 400 wavenumbers, with an overall energy resolution of about 13 wavenumbers. The behavior of the cross-sections for inelastic scattering near the energetic thresholds was accurately measured, and excellent agreement was obtained with cross-sections derived from coupled-channel calculations on ab initio computed potential energy surfaces.
分子散射行为通常在低碰撞能量下很难进行研究。我们通过使一束分子束穿过斯塔克减速器，形成了具有窄速度分布和可调绝对速度的OH自由基分子束。测量了OH自由基与Xe原子非弹性散射的跃迁概率，其作为碰撞能量在50至400波数范围内的函数，整体能量分辨率约为13波数。精确测量了能量阈值附近非弹性散射截面的行为，并与基于从头算计算的势能面通过耦合通道计算得出的截面取得了极好的一致性。
