The Extreme Ultraviolet Spectra of Ne IV, V and VI

Abstract

An electrical discharge suitable for the excitation of high stages of ionization in gases has been developed. This discharge has been used to excite neon gas and the resulting emission has been recorded with a 3-meter grazing incidence vacuum spectrograph. One hundred and seventeen lines have been identified in the spectrum of Ne IV; fifty-six lines in Ne V, and twenty-five in Ne VI. It has been possible to make fairly accurate calculations of the ionization potentials of Ne IV and Ne V as 96.43 volts and 125.8 volts, respectively. The ionization potential of Ne VI is estimated to be 157 volts.