IR‐Chemiluminescence from the Reactions of Atomic Fluorine with Ethyne and Butyne‐2

Abstract

The reactions F + C2H2 and F + C4H6 (2‐butyne) were studied in a low pressure flow system using the IR‐chemiluminescence technique. The vibrational‐rotational state distributions for the product molecule HF were determined for various conditions. For F + C2H2 only secondary reactions can lead to vibrational excitation of HF; with an excess of F‐atoms HF(ν ≤ 7) was observed. For F + C4H6 the primary abstraction yields the vibrational distribution N1:N2:N3:N4 = 26:36:32:7. With an excess of F atoms ν = 5 and ν = 6 are populated. The possible secondary steps are discussed on the basis of our observations.