Abstract
Titration of F atoms with HCl is shown to be described principally by the reaction, F + HCl → HF + Cl. This conclusion is arrived at by observing the effect of HCl titration on the intensity of an F-atom ESR signal, the signal intensity being proportional to F-atom concentration. The intensity decreases linearly with increasing HCl flow and (1.07 ± 0.12) HCl molecules are required for removal of each F atom. Since the titration volume contains F2 as well as F, this latter result demonstrates the secondary importance of the competing reaction, Cl + F2 → ClF + F. Accordingly, F-atom concentration may be determined in the presence of F2 by addition of an excess amount of HCl, thereby converting the F present to HF, and measurement of the amount of HF present by laser optical absorption methods. This alternative (to ESR) technique is important with regard to evaluating HF/DF chemical laser systems where F and F2 are present.
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