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MO: Molekülphysik

MO 12: Posters Friday: Spectroscopy

MO 12.5: Poster

Freitag, 6. April 2001, 12:30–15:00, AT3

The A³Σ⁻−X³Σ⁻ electronic transition of HC₆N — •Olga Vaizert, Tomasz Motylewski, Muriel Wyss, Evgueni Riaplov, Harold Linnartz, and John P. Maier — Institute for Physical Chemistry, Klingelbergstrasse 80, CH 4056 Basel

A combined matrix and gas phase study is presented to identify the A³Σ⁻−X³Σ⁻ electronic transition of the linear triplet isomer of HC₆N. Absorption spectra have been observed in a 6 K neon matrix after mass selection. The gas phase spectra have been recorded at rotational resolution by cavity ring down spectroscopy through a supersonic plasma. The band origin of the A³Σ⁻−X³Σ⁻ electronic transition of HC₆N is determined to be at 21 208.60(5) cm⁻¹, shifted approximately 30 cm⁻¹ to the blue of the neon matrix value. Upon electronic excitation the chain is slightly stretched yielding B₀′ = 0.02792(5) cm⁻¹. Transitions to vibrationally excited levels in the upper electronic state have been observed as well. The results are compared with new electronic spectra of the A³Σ_u⁻−X³Σ_g⁻ electronic transition of the iso-electronic HC₇H species.