MOLECULAR FRAGMENTS IN SHOCK WAVES.
Abstract
The possibility of observing absorption spectra of free, gaseous negative ions like chloride or bromide was investigated. The technique proposed was the vaporization and dissociation of alkali halides by a shock wave, followed by short dura tion absorption spectroscopy. The shock wave method was selected because of its flexibility and relative simplicity. The photodetachment spectra, continuous absorption spectra were ob tained for chlorine, bromine, and iodine. From these spectra, precise values of the halogen electron affinities were obtained. The fluoride 7pectrum was also obtained. It was possible to make preliminary estimates of the photo detach ment cross sections for the various halogens, which are probably within 50% of the true values. Dehydroaromatic molecules were also studied, and benzyne (1,2-dehydrobenzene) in particular. The method of flash photolysis with flash spectros copy was applied to three known precursors of benzyne: benzenediazonium-2-carboxylate, o-iodophenyl mercuric iodide and di-o-iodophenyl mercury. Chemical products were strongly indica tive of the presence of gaseous benzyne, and a transient broad continuous absorption spectra was obtained which has been assigned to benzyne. A peripheral problem of interest was the spectrum and electronic structure of dibenzene chromium. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 30, 1963
- Accession Number
- AD0426567
Entities
People
- R.s. Berry
Organizations
- Yale University