Reports

Diode-laser absorption spectroscopy of supersonic carbon cluster beams: the nu 3 spectrum of C5

Science  05 May 1989:
Vol. 244, Issue 4904, pp. 564-566
DOI: 10.1126/science.11539817

Abstract

A new spectroscopic experiment has been developed in which rovibrational transitions of supersonically cooled carbon clusters, which were produced by laser vaporization of graphite, have been measured by direct-absorption diode-laser spectroscopy. Thirty-six sequential rovibrational lines of the nu 3 band of the C5 carbon cluster have been measured with Doppler-limited resolution. The absorption spectrum is characteristic of a linear molecule with a center of symmetry. Least-squares analysis of the spectrum indicates an effective carbon-carbon bond length of 1.283 angstroms, in good agreement with ab initio quantum chemical calculations. This work confirms the detection of C5 in IRC + 10216 reported in the accompanying paper.

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