Figure 1

(A) Partial IR spectrum of a propyne/Ar (1/500) matrix sample bombarded with 2000-eV electrons at 8 K (absorption multiplies 0.2) and (B) IR difference spectrum of sample in (A) upon photolysis with 385-nm light for 1 h. A: H₂C₃H₂, P: H₃C₃H, A⁺: H₂C₃H₂⁺, P⁺: H₃C₃H⁺, *: H₂C₃H⁺, C_n: carbon clusters.