Decay energetics and lifetime measurements of transient negative ions using Rydberg atoms

dc.contributor.advisorDunning, F. B.
dc.creatorParthasarathy, Ramapriya
dc.date.accessioned2009-06-04T08:29:20Z
dc.date.available2009-06-04T08:29:20Z
dc.date.issued1997
dc.description.abstractDissociative electron attachment to CFCl$\sb3$, CF$\sb2$Br$\sb2$, and 1,1,1- and 1,1,2-C$\sb2$Cl$\sb3$F$\sb3$ is studied by measuring the velocity and angular distributions of negative ions produced through electron transfer in collisions with velocity selected K(np) Rydberg atoms. Data analysis is done with the aid of Monte Carlo simulations. Measurements indicate that the mean lifetimes of the transient ions CFCl$\sb3\sp{-*}$ and CF$\sb2$Br$\sb2\sp{-*}$ are $\sim$3.5 ps and $\sim$4.5 ps respectively and that only a small fraction of the excess energy of reaction appears in translation. The 1,1,1-C$\sb2$Cl$\sb3$F$\sb3$ data show one reaction channel resulting in immediate dissociation with an ion lifetime of $\sim$0 ps, and a second channel associated with a longer lived intermediate, $\tau\ \sim$ 0.1 to 1.0 ps. Only limited energy transfer occurs for the 1,1,2 isomer but the operative reaction channel(s) could not be identified. Possible reaction mechanisms are discussed with the aid of ab-initio calculations.
dc.format.extent68 p.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.callnoTHESIS PHYS. 1997 PARTHASARATHY
dc.identifier.citationParthasarathy, Ramapriya. "Decay energetics and lifetime measurements of transient negative ions using Rydberg atoms." (1997) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/17120">https://hdl.handle.net/1911/17120</a>.
dc.identifier.urihttps://hdl.handle.net/1911/17120
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectAtmospheric sciences
dc.subjectMolecular physics
dc.subjectAtomic physics
dc.titleDecay energetics and lifetime measurements of transient negative ions using Rydberg atoms
dc.typeThesis
dc.type.materialText
thesis.degree.departmentPhysics
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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