The Absorption Spectrum of the Iodine Atom

Abstract

The absorption spectrum of atomic iodine has been investigated in the spectral range $\lambda 2100$ to 1400Å. The iodine was dissociated by heating to 1000°C. A hydrogen discharge tube or an iodine discharge tube was used as the source of illumination. The former source revealed clearly that $\lambda 1830$ and 1783Å are absorption lines. When light from a discharge in iodine was passed through the heated iodine the following lines were found to be weakened by absorption, $\lambda 1830$, 1783, 1642, 1618, 1583, 1515, 1507 and 1422Å.