OPTICAL ABSORPTION OF SELENIUM IN ALPHA-MONOCLINIC CRYSTAL AND SOME SOLVENTS

The optical absorption of α-monoclinic selenium has been measured over the range in wavelength 1.15-0.2775 μ. The data shows a well defined absorption edge at 2.25 eV with further structure appearing as changes in dα/dE at 2.85 eV and 3.75 eV. For comparison the absorption of selenium in solutions in which it is believed to exist in the same eight-membered puckered ring as in the crystal was measured. This absorption is qualitatively different from that of the crystal. © 1969.