Dications as High Energy Species: Graduate Training in Chemical Physics at JILA. Supplement.
Abstract
During the past year, ASSERT scholar Joseph Kim and graduate student Jim Smith have been working on the coaxial laser-ion spectrometer which had previously been utilized to elucidate the dissociation dynamics of dications. The thrust of his work has now changed, to emphasize studies of dynamics in ionic clusters where the cluster consists of a fuel oxidant and an ionic core. The first step in making this transition concerned efforts to produce cold ions and cluster ions in the coaxial beam machine. Mr. Kim has made major modifications to the ion source, installing a pulse supersonic expansion and a new electron beam system to enable the production of cold cluster ions. There have been a number of technical details associated with the production of cold ions which have slowed progress in the last year. There were many problems associated with electrical breakdown in the floating ion source and with collisional heating of the ions. All of these problems have now been solved, and we are able to produce cold cluster ions on a relatively routine basis. The best "thermometer" to characterize the ion source has proven to be the rotational temperature of OH(-). The first photodetachment spectra of OH(-) are being obtained by Mr. Kim at present, and he has already demonstrated surprisingly sharp photodetachment thresholds. It appears that the long range forces involved with the OH permanent dipole moment dramatically alter the photodetachment threshold law, greatly increasing the rate at which the cross section rises very near threshold. This sharp rise will be a very important diagnostic in the studies of the structure of cluster ions. jg p.2
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1995
- Accession Number
- ADA299422
Entities
People
- S. V. Oneil
- Stephen R. Leone
- W. C. Lineberger
Organizations
- University of Colorado Boulder