Development of a New Molecular Beam-Variable Temperature Ion Trap (CP-22PT) for Chemistry Research

在化学研究仪器和设施：仪器开发（CRIF：ID）计划的支持下，亚利桑那大学化学系将在Mark A.史密斯分子束变温离子阱。 该22极陷阱将允许：a）俘获离子的多个反应探针，包括使俘获离子与可凝聚物质的低速致密分子束相互作用以及化学探测反应产物的能力，B）使用脉冲试剂气体/缓冲气体碰撞冷却原位合成复合分子离子，用于随后的束物质速率测量，以及c）使用其他技术的未来研究，例如离子的状态选择激光泵浦，分子或自由基的中性束的速度选择，以及将这些技术扩展到低于1 K的温度范围。 拟议的仪器开发将使合作者能够研究星际感兴趣的极低能量简单离子反应作为温度的函数，从极低温度开始，逐渐增加到高温（4- 800 K）。它结合了亚利桑那实验室完善的超音速束扩展技术和弗赖堡高度复杂的22极离子阱技术。.这两个实验室的合作，在开发这一仪器的同时，仪器的研究氢原子和低能电子-离子复合提供了一个独特的教育资源，为学生的培训，在天体化学/实验室天体物理学以及一般的反应动力学。该仪器将直接应用于反应动力学的基础研究以及化学分析，光谱学和络合离子合成。

With support from the Chemistry Research Instrumentation and Facilities: Instrument Development (CRIF:ID) Program, the Department of Chemistry at the University of Arizona will develop under the direction of Mark A. Smith a molecular beam-variable temperature ion trap. This 22 pole trap will allow for: a) multiple reaction probes of trapped ions including the capability to interact trapped ions with low velocity, dense molecular beams of condensable species and to chemically probe reaction products, b) in situ synthesis of complex molecular ions using pulsed reagent gas/buffer gas collisional cooling for subsequent beam species rate measurements, and c) future studies using other techniques such as state-selected laser pumping of ions, velocity selection of neutral beams of molecules or radicals, and extension of these techniques into the temperature range below 1 K.This project will be carried out in collaboration with Freiburg University. The proposed instrumentation development will enable the collaborators to investigate very low energy simple ion reactions of interstellar interest as a function of temperature, beginning at very low and increasing to high temperatures (4-800K). It combines supersonic beam expansion techniques perfected in the Arizona Laboratory with highly sophisticated 22-pole ion trap technology at Freiburg. . The cooperation of the two laboratories in development of this instrument in parallel with instrumentation for the study of hydrogen atom and low energy electron-ion recombination presents a unique educational resource for the training of students in both astrochemistry/laboratory astrophysics as well as general reaction dynamics. The instrument will find direct application in fundamental studies of reaction dynamics as well as in chemical analysis, spectroscopy and complex ion synthesis.