Department of Chemistry, Faculty of Science, Ege University, 35100 Bornova, Izmir, Turkey.
Phys Chem Chem Phys. 2010 Jul 28;12(28):7950-8. doi: 10.1039/b925347e. Epub 2010 Jun 2.
We report measurements of the electron stimulated desorption (ESD) of anions and cations from thin films of allyl glycidyl ether (AGE), formed by condensation onto multilayer Kr and Pt substrates using a high sensitivity time of flight mass analyser. Measurements were performed as a function of film thickness, incident electron energy (E(i)) and effective incident current. Below incident electron energies of 20 eV the desorption of anions is dominated by the process of dissociative electron attachment (DEA) via several transient negative ions at E(i) between 5.5 and 16.5 eV. Comparisons between measurements for AGE and ethyl oxirane show that the ESD of anions is essentially that of the glycidyl (epoxide) ring, though DEA occurring at the ether, within the linear part of the AGE molecule is also observed. Cation yields are dominated by the desorption of small fragments formed via scission of the same ether bond.
我们报告了通过高灵敏度飞行时间质谱仪，使用冷凝在多层 Kr 和 Pt 衬底上的方法，从烯丙基缩水甘油醚 (AGE) 薄膜中测量电子刺激脱附 (ESD) 的阴离子和阳离子。测量结果作为薄膜厚度、入射电子能量 (E(i)) 和有效入射电流的函数。在入射电子能量低于 20 eV 时，阴离子的脱附主要通过在 5.5 到 16.5 eV 之间的几个瞬态负离子通过离解电子捕获 (DEA) 来进行。AGE 和氧化乙基的测量结果比较表明，阴离子的 ESD 基本上是缩水甘油基 (环氧化物) 环的 ESD，尽管在 AGE 分子的线性部分中也观察到在醚基上发生的 DEA。阳离子产率主要由通过相同醚键的断裂形成的小碎片的脱附所控制。
