Studies of Electron-Ion Interactions Using the CRYRING Heavy-Ion Storage Ring Facility
Abstract
This report results from a contract tasking Stockholm University as follows: CRYRING, a synchrotron/heavy-ion storage ring facility, has proved to be a powerful tool for measurements of branching ratios in recombination of polyatomic molecular ions. However, there are important questions that still need to be addressed for organic ions such as: 1)Is there a mass limit at which fragmentation decreases or even vanishes and most or all of the electron energy is converted to internal degrees of freedom? 2) What is the order, n, of the dissociation shown in reaction? 3)Is the fragmentation process instantaneous? Or is there a delay in the break-up process? For a small inorganic ion such as H20+ the break-up process is most likely instantaneous, but whether this is also true for larger organic ions is unknown. 4)IS the break-up process a one-step or a multi-step process? Prediction of the products of dissociative recombination is very difficult. It is here proposed to study not only the rates of dissociative recombination of ions important for plasma-enhanced combustion but also the neutral product distributions. Experiments with many important hydrocarbon ions (the benzene cation, for example) will be performed. Another problem concerns the resolution of the solid-state particle detector, because well-resolved mass peaks facilitate the measurement of product branching ratios. Deuterated molecules and peak fitting procedures will be applied to enhance the resolution. The proposed measurements will add greatly to the knowledge base in this unexplored field, yielding answers to the questions outlined above and serving as important inputs to the Air Force combustion models.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2002
- Accession Number
- ADA406352
Entities
People
- Mats Larsson
Organizations
- Stockholm University