The vacuum ultraviolet spectra of ethyleneimine and trimethyleneimine

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Abstract
Experimental studies of the vacuum ultraviolet absorptionspectrum of ethyleneimine in the region 40 000–60 000 cm−1 yield maxima at 6.32 and 7.15 eV, with oscillator strengths of 0.003 and 0.086, respectively. Trimethyleneimine has in the same region a band maximum at 6.44 eV with an oscillator strength of 0.047. Semiempirical SCF–CI calculations using the CNDO method with Sichel–Whitehead parameters are reported on 3‐, 4‐, and 5‐membered ring compounds in the series of saturated alkanes, ethers, and amines and the predicted transitions are compared with experimental interpretations of the nature of the excitations.