Articles with tag: "x-ray diffraction"

(Note: figures do not appear in the summaries below)

  1. NACA-TN-2532

    "supercooled water was concluded to become progressively more ice-like as the temperature is lowered"

    "X-Ray Diffraction Study of the Internal Structure of Supercooled Water" 1

    Figure 3. Diffraction intensity curves of water and supercooled water between 21 C and -16 C corrected ofr absorption and polarization; wavelength approximately 0.71 angstroms.

    SUMMARY

    A Bragg X-ray spectrometer equipped with a volume-sensitive Geiger counter and Soller slits and employing filtered molybdenum Kα, radiation was used to obtain a set of diffracted intensity curves as a function of angle for supercooled water. Diffracted intensity curves in the temperature region of 21° to -16° C were obtained. The minimum between the two main diffraction peaks deepened continuously with lowering temperature, indicating a gradual change in the internal structure of the water. No discontinuity in this trend was noted at the melting point. The internal structure of supercooled water was concluded to become progressively more ice-like as the temperature is lowered.

    Discussion

    The extensive equations included in this publication area not detailed herein.

    APPARATUS AND PROCEDURE

    A Bragg X-ray spectrometer equipped …

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