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. 1993 Jan-Feb;98(1):59–69. doi: 10.6028/jres.098.005

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 4 — Measured dispersion curves for the 12 external and the 4 lowest internal modes in anthraene al 12 K for the [ζ00], [0ζ0] and [00ζ] directions. The presentation is given in the expended zone scheme such that branches must not cross. Some dispersion curves in the [0.5, ζ, 0] direction are also shown [6].