III-M-7 Pump-Probe Measurements of the Predissociation Reaction Time of C₂H₂ from Ã(¹A_u) State

Nobuhisa HASHIMOTO (Grad. Univ. for Advanced Studies), Nobuaki YONEKURA and Toshinori SUZUKI

[Chem. Phys. Lett. 264, 545 (1997)]

The predissociation reaction time from Ã(¹A_u) state of acetylene has been measured by a pump-probe method. The H-atom signal was found to decay in 69 ns at V⁵K¹, J' = 2 (E_excess = 1192.6 cm^-1) and 38 ns at V⁶K¹, J' = 2 (E_excess = 2168.3 cm^-1) levels. These values are considered to be the upper bounds for the lifetime of a metastable doorway state for dissociation at these energies.

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