Khreis Jusuf M, Ameixa João, Ferreira da Silva Filipe, Denifl Stephan
Institut für Ionenphysik und Angewandte Physik, Leopold Franzens Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
Beilstein J Nanotechnol. 2017 Dec 4;8:2583-2590. doi: 10.3762/bjnano.8.258. eCollection 2017.
Interactions of low-energy electrons with the FEBID precursor Cr(CO) have been investigated in a crossed electron-molecular beam setup coupled with a double focusing mass spectrometer with reverse geometry. Dissociative electron attachment leads to the formation of a series of anions by the loss of CO ligand units. The bare chromium anion is formed by electron capture at an electron energy of about 9 eV. Metastable decays of Cr(CO) into Cr(CO), Cr(CO) into Cr(CO) and Cr(CO) into Cr(CO) are discussed. Electron-induced dissociation at 70 eV impact energy was found to be in agreement with previous studies. A series of Cr(CO) C (0 ≤ ≤ 3) cations formed by C-O cleavage is described for the first time. The metastable decay of Cr(CO) into Cr(CO) and collision-induced dissociation leading to bare Cr, are discussed. In addition, doubly charged cations were identified and the ration between doubly and singly charged fragments was determined and compared with previous studies, showing considerable differences.
在一个与具有反向几何结构的双聚焦质谱仪耦合的交叉电子-分子束装置中，研究了低能电子与聚焦电子束诱导沉积（FEBID）前驱体Cr(CO)₆的相互作用。解离电子附着通过CO配体单元的损失导致一系列阴离子的形成。在约9 eV的电子能量下通过电子捕获形成裸铬阴离子。讨论了Cr(CO)₆向Cr(CO)₅、Cr(CO)₅向Cr(CO)₄以及Cr(CO)₄向Cr(CO)₃的亚稳衰变。发现在70 eV碰撞能量下的电子诱导解离与先前的研究一致。首次描述了通过C - O裂解形成的一系列Cr(CO)₆₋ₙCₙ⁺（0 ≤ n ≤ 3）阳离子。讨论了Cr(CO)₅向Cr(CO)₄的亚稳衰变以及导致裸Cr的碰撞诱导解离。此外，鉴定了双电荷阳离子，并确定了双电荷和单电荷碎片之间的比例，并与先前的研究进行了比较，显示出相当大的差异。
