Optical Studies of Hydrogen Above 200 Gigapascals: Evidence for Metallization by Band Overlap
作者： Russel J Hemley , HK Mao
DOI: 10.1126/SCIENCE.244.4911.1462
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摘要: Direct optical observations of solid hydrogen to pressures in the 250-gigapascal (2.5-megabar) range at 77 K are reported. Hydrogen samples appear nearly opaque at the maximum pressures. Measurements of absorption and Raman spectra provide evidence that electronic excitations in the visible region begin at∼ 200 gigapascals. The optical data are consistent with a band-overlap mechanism of metallization.
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