Technical Comments

Comment on “Observation of the Wigner-Huntington transition to metallic hydrogen”

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Science  25 Aug 2017:
Vol. 357, Issue 6353, eaan2286
DOI: 10.1126/science.aan2286


  • Fig. 1 Pressure versus load.

    (A) Our data and data from (4). (B) Data from Dias and Silvera (1). (C) Some raw IR absorption spectra provided but not plotted in (1) (in color). The black curves are normalized spectra taken from figure S1 in (1). We note that the intensity and frequency of the raw spectra at 338 GPa do not match those displayed in figure S1 in (1).

  • Fig. 2 Photos of the sample from (1) and (14).

    (A) Photo of the semitransparent sample at 420 GPa from (14). (B) Photo of the dark sample at 415 GPa from (1). (C and D) Photos of the samples at 205 and 495 GPa from (1). We have used the 30 μm stated by (1) as being the size of the culet as the scale to estimate the size of the sample. In the vertical direction, the sample reaches 15 μm, which is almost twice as large as the 8 to 10 μm stated in (1). For comparison, the size of the hydrogen sample at 390 GPa was ~2 μm; see figure 3 in (10).

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