Scattering Dynamics of Hyperthermal Oxygen Atoms on Ionic Liquid Surfaces: [emim][NTf2] and [C12mim][NTf2]
Scattering Dynamics of Hyperthermal Oxygen Atoms on Ionic Liquid Surfaces: [emim][NTf2] and [C12mim][NTf2]
复制标题
高温氧原子在离子液体表面的散射动力学：[emim][NTf2]和[C12mim][NTf2]
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
G. Schatz
中科院分区：
文献类型：
--
作者：
Bohan Wu;Jianming Zhang;T. Minton;K. McKendrick;John M. Slattery;Scott Yockel;G. Schatz
用束面散射技术研究了高热氧原子在连续刷新的离子液体--1-乙基-3-甲基咪唑双(三氟甲磺酰基)亚胺([EMIM][NTF2])和1-十二烷基-3-甲基咪唑双(三氟甲基磺酰基)亚胺([C12mim][NTF2])上的碰撞.利用旋转质谱计探测器收集了不同入射角度下非弹性散射O和反应散射OH和H2O的飞行时间和角分布。对于O和OH，发现了两个不同的散射过程，根据经验可以将其归类为热的和非热的。对于O和OH产物，非热散射的可能性都更大。对羟基的观察证实，至少有一些活性中心，可能是烷基，必须暴露在表面。烷基链长的离子液体[C12mim][NTF2]比L的活性要强得多。
Collisions of hyperthermal oxygen atoms, with an average laboratory-frame translational energy of 520 kJ mol−1, on continuously refreshed ionic liquids, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([emim][NTf2]) and 1-dodecyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([C12mim][NTf2]), were studied with the use of a beam-surface scattering technique. Time-of-flight and angular distributions of inelastically scattered O and reactively scattered OH and H2O were collected for various angles of incidence with the use of a rotatable mass spectrometer detector. For both O and OH, two distinct scattering processes were identified, which can be empirically categorized as thermal and nonthermal. Nonthermal scattering is more probable for both O and OH products. The observation of OH confirms that at least some reactive sites, presumably alkyl groups, must be exposed at the surface. The ionic liquid with the longer alkyl chain, [C12mim][NTf2], is substantially more reactive than the l...