language: en

Alkali-Halide Chemiluminescence : Studies on the Fluctuation Bands from some Alkali (Li, Na, R)-Halogen (CI, Br, I)-Reactions

M. Roeder
I . Institut für Experimentalphysik der Universität Hamburg
Z. Naturforsch. ftoa, 955-959 (1980);

[received July 11 1980]

Molecular chemiluminescence spectra from selected alkali-halogen reactions are presented using a beam-gas arrangement operating with pressures between 10 -1 mtorr ( single collision conditions ) up to 10 mtorr in the reaction zone. Spectra are presented for the chemiluminescent reactions M2 -f X2- MX * + MX, where M2 — K2» Na2 and X2 = C^t B*2,I2. The MX * emitter is identified by comparison with previous absorption and emission studies of these molecules. The sodium reaction with 12 as well as all lithium reactions with different halogens ( CI2, Br2,12 ) do not yield appreciable molecular emission. The difference« in molecular chemiluminescence intensities among this type of reactions can be understood in terms of the Landau-Zener formalism for an electron jump and turn out to be consistent with the results from measurements on absorption, emission and dissociation.

Introduction