Quantitative Determination of Extinction Coefficients in the Vacuum Ultraviolet: Divinyl Ether

Abstract

A method of determining the molar extinction coefficients of organic compounds in the vapor phase in the vacuum ultraviolet has been developed. Measurements made with a fluorite spectrograph on flowing vapor samples of divinyl ether show a precision of 3 to 8 percent and satisfactory agreement with measurements made from 2360 to 2100A with a Beckman DU spectrophotometer. The absorption spectrum of divinyl ether is completely free from fine structure. The extinction coefficient increases rapidly from a value of 10 at 42,400 cm⁻¹ to a maximum of 15,900 at 49,200 cm⁻¹ and decreases to a minimum value of 4000 before beginning to rise again at 56,700 cm⁻¹. The oscillator strength of the band is 0.45.