Photoabsorption, photoionization and neutral-dissociation cross sections of cyclopropane in the photon energy range of 10-24 eV

We measure the photoabsorption cross sections and photoionization quantum y ields of cyclopropane in the photon energy range of 10-24 eV by means of a double ionization chamber equipped with a window and synchrotron radiation as a continuous-wavelength light source. The photoionization cross sections and neutral-dissociation cross sections are derived from them. It is verif ied that our values are more correct and comprehensive than those reported before. Several superexcited states, valence-excited states and Rydberg sta tes, are found in the curves of cross section against photon energy mention ed above, and it turns out that they are classified into three groups accor ding to the features of the competition between neutral dissociation and au toionization.