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Osnabrück 2002 – wissenschaftliches Programm

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MO: Molekülphysik

MO 7: Poster I (Experimentelle Techniken, Spektroskopie, Cluster)

MO 7.18: Poster

Mittwoch, 6. März 2002, 11:00–13:00, Schloss

Rotationally resolved A3Σ(u) X3Σ(g) electronic spectra of NC5N and HC6N — •Harold Linnartz, Olga Vaizert, Pawel Cias, Lucia Grüter, Tomasz Motylewski, Muriel Wyss, Evgueni Riaplov, and John P. Maier — Institut für Physikalische Chemie, Klingelbergstrasse 80, CH 4056 Basel

The rotationally resolved A3Σ − X3Σ electronic origin band spectrum of the iso-electronic carbon chain radicals NC5N and HC6N have been observed in the gas phase by cavity ring down spectroscopy through a supersonic planar plasma. The origin band of NC5N is found at 22832.7(1) cm−1 and a rotational analysis provides constants B0″ = 0.02799(4) cm−1 and B0′ = 0.02778(3) cm−1. These are compared to the Be values predicted by DFT calculations and show that the molecule has a linear and centro-symmetric NCCCCCN structure [1].
The band origin of HC6N is found at 21208.60 cm−1. The rotational constants indicate that the chain is slightly stretched on electronic excitation, yielding B0′ = 0.02792(5) cm−1. The results are compared with improved spectra of the 000 A3Σu − X3Σg electronic transition of the iso-electronic HC7H species.
[1] Chem. Phys. Lett. 345 (2001) 89; [2] J. Chem. Phys. 114 (2001) 7918.

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