Double Beam Vacuum Spectrophotometer for Far Ultraviolet Investigations

Abstract
A spectrophotometer for measuring the transmission of gaseous and liquid samples in the range of 2500 to 1150 Å and having a resolution of 0.3 Å is described. Tests made show that by using the electronic ratio method a higher accuracy may be obtained than by the optical balancing method. Some spectra are discussed for demonstrating the performance of the spectrophotometer.