Observations of Li i and Li ii absorption spectra in the grazing incidence region*

Abstract

The atomic spectra of Li i and Li ii have been observed in the region 215–160 A. The flash-pyrolysis technique has been used to produce the atomic vapor. A toroidal focusing mirror has been used which allows the background continuum from the BRV source to be photographed with a single shot. Thirteen lines of the principal series of singly ionized lithium and the continuous absorption at the limit of the series have been observed. Absorption lines from inner-shell excitation of neutral lithium have also been observed and tentatively identified.