Vacuum Ultraviolet Absorption Spectra of 1,4-Dioxane and 1,3-Dioxane

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Abstract
The spectrum of 1,4‐dioxane shows strong absorption regions with intensity maxima at 55 500, 63 000, 69 500, and 72 000 cm—1, and an absorption region whose maxima is obscured by the last two absorption regions. A first ionization potential was located at 76 750 cm—1 (9.52 ev) which agrees with the value determined by electron impact (9.52 ev). The first electronic transition shows considerable virbrational structure, and the analysis of this structure indicates that the upper‐state vibrational frequencies are only slightly changed from those of the normal state. The other electronic transitions form a possible Rydberg series which converges to the first ionization potential. 1,3‐dioxane shows an absorption region with a maximum at 62 500 cm—1, and another very strong continuous absorption region beginning at about 67 500 cm—1. There is no apparent discontinuity in the region of the ionization potential. The electronic spectrum of 1,3‐dioxane showed no vibrational structure.