$Pb + F_{2}$ CHEMILUMINESCENCE: AN EXTENSION OF THE PbF $A(\Omega = 1/2) - X_{1}\ ^{2}\Pi_{ 1/2}$ BAND SYSTEM

Abstract

Studies are made of the visible chemiluminescence resulting from the reaction of Pb with $F_{2}$ under single-collision conditions $(\sim 10^{-4} Torr)$ and at pressures of a few Torr of argon. The PbF A-X band $system^{1,2} (\sim 4000-5500$ {\AA}) is reanalyzed since many new bandheads$(\approx 40)$ were found in the chemiluminescence spectra. Fifty-one bandheads were observed in the red $(\sim 6700$ to $8000$ {\AA}), They result from the emission between higher PbF states and suggest the existence of a new PbF state.