title: Experimental determination of the nu5 cis-bending vibrational frequency and Renner-Teller structure in ground state (X2Piu) C2H2+ using laser induced reactions.
abstract: The spectrum of the nu(5) cis-bending vibration of ground state (X(2)Pi(u)) C(2)H(2)(+) has been recorded applying the method of laser induced reactions in a low-temperature 22-pole ion trap. It is obtained by counting the number of products of the reaction C(2)H(2)(+) (v(5) = 1) + H(2)--> C(2)H(3)(+) + H as a function of the laser wavelength. The vibronic transitions Delta-Pi and Sigma-Pi with their corresponding spin-orbit and Renner-Teller substructure have been observed. Using a perturbative analysis, the vibrational frequency has been determined to omega(5) = (710 +/- 4) cm(-1) and the Renner-Teller parameter epsilon(5) is on the order of 3 x 10(-2).
authors.affiliation: Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands.
authors.forename: O
authors.initials: O
authors.lastname: Asvany
authors.forename: T
authors.initials: T
authors.lastname: Giesen
authors.forename: B
authors.initials: B
authors.lastname: Redlich
authors.forename: S
authors.initials: S
authors.lastname: Schlemmer