Ion–molecule reactions of CoAr₆⁺ with nitrogen oxides N₂O, NO, and NO₂: measuring absolute pressure by shock-freezing of the collision complex

• Published in: Физика низких температур
• Date: 2010
• Main Authors: Linde, C. van der, Höckendorf, R.F., Balaj, O.P., Beyer, M.K.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2010
• Subjects: Nanostructures and Impurity Centers in Cryogenic Environment
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/117041
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Ion–molecule reactions of CoAr₆⁺ with nitrogen oxides N₂O, NO, and NO₂: measuring absolute pressure by shock-freezing of the collision complex / C. van der Linde, R.F. Höckendorf, O.P. Balaj, M.K. Beyer // Физика низких температур. — 2010. — Т. 36, № 5. — С. 516-523. — Бібліогр.: 63 назв. — англ.

A new method to determine the absolute pressure in an ultra-high vacuum apparatus is tested using ion molecule reactions with CoAr₆⁺. In a collision with a neutral reactant, the complex between Co⁺ and the collision partner is stabilized by evaporation of argon atoms. If CoAr₆⁺ reacts with collision rate, the absolute pressure can be determined by comparing the experimental collision rate with the collision rate calculated from average dipole orientation theory. The experimental results with N₂O, NO, and NO₂ indeed show that the collision complex is frozen out. Comparison of the rates of primary, secondary and tertiary reaction products, however, suggests that not all collisions of CoAr₆⁺ are reactive.