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The absolute cross sections for the production of N+ and N+2 have been measured from the dissociative ionization threshold to 115 Å. In addition, the absolute photoabsorption and photoionization cross sections are tabulated between 114 and 796 Å. The ionization efficiencies are also given at several discrete wavelengths between 660 and 790 Å. The production of N+ fragment ions are discussed in terms of the doubly excited N+2 states with binding energies in the range 24 to 44 eV. [ABSTRACT FROM AUTHOR]

The partial photoionization cross sections for producing the NO+ parent ion and the O+, N+, and NO2+ fragment ions from neutral NO are presented from 120 to 614 Å. The results indicate predissociation of the c 3Π (21.72 eV) and B’ 1Σ+ (22.73 eV) electronic states of NO+. The photoionization threshold for double ionization was found to be 39.4±0.12 eV. [ABSTRACT FROM AUTHOR]

Absolute cross sections for the production of H+ and H2+ have been measured from the dissociative ionization threshold at 18.076–124 eV. A broad resonance occurs in the H+ cross section caused primarily by autoionization of the Q1 Rydberg states. The absolute cross section for producing neutral atoms only is obtained by the use of published photoionization yield data. It is shown that the sum of the neutral and ionized H fragments produce a major resonance representing transitions into the Q1 and Q2 Rydberg states. [ABSTRACT FROM AUTHOR]

Absolute absorption and photoionization cross sections of methane have been measured with an accuracy of about 2% or 3% over most of the wavelength range from 950 to 110 Å. Also, dissociative photoionization cross sections were measured for the production of CH+4 , CH+3 , CH+2 , CH+, and C+ from their respective thresholds to 159 Å, and for H+ and H+2 measurements were made down to 240 Å. Fragmentation was observed at all excited ionic states of CH4. [ABSTRACT FROM AUTHOR]

A new apparatus for the study of photoionization processes has been designed and constructed. The main capabilities of the apparatus include measurements of angle-resolved photoelectrons, as well as time-of-flight measurements of photoions in coincidence with total, energy selected, or threshold electrons. [ABSTRACT FROM AUTHOR]

Examines the production of a negative lithium (Li) ion beam from a thermal contact-ionization plasma source. Components of the plasma source; Intensity of the negative ion current; Ion species analysis using time-of-flight technique.