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Rydberg electron transfer to SF6: product ion lifetimes
1Department of Physics and Astronomy and the Rice Quantum Institute, MS 61 Rice University, 6100 Main Street, Houston, Texas 77005-1892, USA.
The Journal of Chemical Physics
|June 25, 2005
Summary
Sulfur hexafluoride (SF6) negative ions formed via Rydberg electron transfer exhibit lifetimes ranging from 1 to over 10 milliseconds. These findings are consistent with ions formed by direct electron attachment.
Area of Science:
- Physical Chemistry
- Atomic and Molecular Physics
- Chemical Physics
Background:
- Sulfur hexafluoride (SF6) is a molecule of interest in various industrial applications.
- Understanding the formation and stability of SF6 negative ions (SF6-) is crucial for related chemical processes.
- Rydberg electron transfer is a mechanism for forming negative ions from neutral molecules.
Purpose of the Study:
- To investigate the lifetimes of SF6- ions produced through Rydberg electron transfer in K(np)SF6 collisions.
- To compare the lifetimes of SF6- ions formed by Rydberg electron transfer with those formed by direct electron attachment.
Main Methods:
- Utilizing a Penning ion trap to study ion-molecule collisions.
- Examining SF6- ion lifetimes following Rydberg electron transfer at high principal quantum numbers (n ≥ 30).
- Measuring the attachment of free low-energy electrons to SF6 within the ion trap.
Main Results:
- SF6- ions generated by Rydberg electron transfer display a broad range of lifetimes, from approximately 1 ms to over 10 ms.
- A significant population of SF6- ions persists in the trap for up to 40 ms, indicating radiative stabilization.
- The lifetimes of SF6- ions formed via Rydberg electron transfer are comparable to those produced by direct low-energy electron attachment to SF6.
Conclusions:
- Rydberg electron transfer is an effective method for producing long-lived SF6- ions.
- Radiative stabilization plays a role in the extended lifetimes observed for SF6- ions.
- The similarity in lifetimes suggests common underlying stabilization mechanisms for SF6- ions formed through different electron attachment pathways.
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