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Laser isotope separation. Photochemical scavenging of chlorine-37 by bromobenzene

Authors: Richard N. Zare; D. M. Brenner; Saswati Datta;

Laser isotope separation. Photochemical scavenging of chlorine-37 by bromobenzene

Abstract

The photochemical reaction of iodine monochloride with bromobenzene yields chlorobenzene as enriched in either /sup 35/Cl or /sup 37/Cl depending on the excitation wavelength. A gas mixture of ICl and C/sub 6/H/sub 5/Br is irradiated by the output of a cw dye laser (01 A bandwidth) tuned to the (18,0) bandhead at 6053 A of the I/sup 37/Cl A /sup 3/II/sub 1/-X/sup 1/SIGMA/sup +/ system. At pressures of several Torr, C/sub 6/H/sub 5//sup 37/Cl is formed with a quantum yield of 10 percent and a maximum enrichment factor of 9 (75 percent /sup 37/Cl). The extent of enrichment is found to vary with starting conditions, permitting study of the mechanism for isotopically specific reaction and attendent scrambling pathways. Formation of C/sub 6/H/sub 5//sup 37/Cl involves direct reaction of I/sup 37/Cl* with C/sub 6/H/sub 5/Br to produce a vibrationally hot radical intermediate, which retains to a high degree its isotopic integrity because of more rapid elimination of Br atom than radical chain propagation. Comparison of iodobenzene with bromobenzene shows that the rate-limiting step must involve a Cl atom migration about the ring which is in competition with loss of Cl atom. While excited ICl transfers Cl to unsaturated halogenated hydrocarbons, nomore » reaction is observed with saturated halogenated hydrocarbons. The general form of this mechanism demonstrates isotopically specific synthesis involving reaction mixtures of natural abundance as starting materials.« less

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
21
Average
Top 10%
Top 10%
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