The C7 cluster : structure and infrared frequencies

Observation and characterization of the C7 cluster are reported. Carbon clusters are produced by laser vaporization of a graphite target followed by supersonic expansion of the vaporized material within a gas dynamically focused argon jet. Thirty-six sequential rovibrational lines of the nu 4 antisy...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1990-08, Vol.249 (4971), p.895-897
Main Authors: HEATH, J. R, SHEEKS, R. A, COOKSY, A. L, SAYKALLY, R. J
Format: Article
Language:English
Subjects:
Argon
Astronomy - instrumentation
Astronomy - methods
Astrophysics
Atomic and molecular physics
Carbon
Carbon - analysis
Carbon - chemistry
Electronic structure of atoms, molecules and their ions: theory
Exact sciences and technology
Lasers
Mass spectrometry
Physics
Solar System
Space life sciences
Spectra
Spectrophotometry, Infrared
Spectrum Analysis
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Summary:Observation and characterization of the C7 cluster are reported. Carbon clusters are produced by laser vaporization of a graphite target followed by supersonic expansion of the vaporized material within a gas dynamically focused argon jet. Thirty-six sequential rovibrational lines of the nu 4 antisymmetric stretch fundamental of C7 are probed by gated detection of diode laser absorption. The observed spectrum is characteristic of a symmetrical linear molecule. Analysis of the spectrum indicates an effective average bond length of 1.2736(4) angstroms and a vibrational frequency of 2138.1951(10) reciprocal centimeters, in excellent agreement with ab initio calculations. This work will facilitate the astrophysical detection of this cluster.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.11538081