Absorption Intensities of Ethylenes and Acetylenes in the Vacuum Ultraviolet

The spectra of three octenes, cyclohexene and 2,3-dihydropyrane, and of octyne−1 and −2 were obtained in n-heptane solution to 1700A. Intensity measurements on ethylene vapor to 1550A enable the contribution of the Rydberg bands to be separated from that of the continuum. The f-values in ethylene and the octenes are about 0.30, agreeing with Mulliken and Rieke's theoretical prediction within the experimental uncertainty of about 20 percent. The f-values of the octynes are about the same, but those of cyclohexene and dihydropyrane are about 0.20.