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Articles you may be interested inDissociative double photoionization of singly deuterated benzene molecules in the 26-33 eV energy range Single and double ionization of nitric oxide by electron impact from threshold up to 180 eV Photoionization and photodissociation of NO has been studied using 9-35 eV synchrotron light and detection of fluorescence as well as of mass selected NO ϩ , N ϩ , O ϩ , and O Ϫ ions. Rydberg series converging to all known states in NO ϩ below 24 eV have been analyzed and classified and several of them are found to be predissociated by various NO ϩ states as well as by NO ion pair states. The complex structure in the 950-1200 Å excitation region is suggested to originate from interaction between a ''new'' NO valence state at T 0 ϭ77 470 cm Ϫ1 and high vibrational levels of Rydberg series converging to the NO ϩ ground state.

Photon induced fluorescence from O2 has been studied in various emission regions 1150-6500 Å in the excitation range 14-28eV using the Swedish synchrotron facility MAX in Lund. A rich line structure is observed which is interpreted in terms of autoionization and dissociation of Rydberg levels converging to the a, b, c, and B states in O2+. New features have been observed, for instance, concerning the (c 4Σu−) 3sσg Fano resonance which has been viewed in detail in different detection channels including O2+ and O+ ions.

Abstract. Carbon monoxide has been excited with monochromatic synchrotron radiation in the 14-35 eV range using the Swedish synchrotron facility MAX in Lund. The decay products were studied in various detection channels such as formed CO + and C + ions using mass spectroscopy and visible or VUV fluorescence using photon detection. A rich line structure is observed which is attributed to CO Rydberg series converging to the X, A, B, D, C and E states in CO +. While a great number of these lines are already known, some of them are classified here for the first time. The combination of information from the fluorescence spectra and the mass spectra contribute important information concerning the autoionization and predissociation of these various Rydberg series. 33.20.N; 33.80.E; 33.80.G have not been firmly established until recently. Thus, it is tempting to look fo r Rydberg series converging to these doubly excited states in various detection channels. Moreover, the lower Rydberg series converging to the X, A and B states of CO ÷ are very complex and fluorescence measurements could, hopefully, give additional information concerning their decay channels. To our knowledge such fluorescence studies using a continuous excitation have only been performed for emission wavelengths larger than 2100 A [3][4][5]. PACS:Since the notations of the doubly excited states in CO + vary in different papers, Table 1 shows the notations used in the present work together with very recently established level energies from photoelectron spectroscopy [6]. These notations have been introduced by some authors to make an analogy to the isoelectronic case of N~.