title: Measurement of the partial photoionization cross sections and asymmetry parameters of S atoms in the photon energy range 10.0-30.0 eV using constant-ionic-state spectroscopy.
abstract: The partial photoionization cross sections and asymmetry parameters of S atoms have been measured using constant-ionic-state (CIS) spectroscopy in the photon energy range 10.0-30.0 eV. The ionizations investigated in these CIS experiments are the (3p)(-1) ionizations S(+)((4)S)<--S((3)P), S(+)((2)D)<--S((3)P), and S(+)((2)P)<--S((3)P). For the first time Rydberg series which converge to the fourth ionization limit have been observed and assignments of these series have been proposed. These correspond to excitations to Rydberg states that are parts of series which converge to the fourth ionization limit, S(+)((4)P)<--S((3)P) (3s)(-1), and autoionize to the lower S(+)((4)S), S(+)((2)D), or S(+)((2)P) states. For each series observed in the CIS spectra photoelectron angular distribution studies, combined with other evidence, has allowed the angular momentum character of the free electron on autoionization to be determined.
authors.affiliation: Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Innocenti
authors.forename: Lucia
authors.initials: L
authors.lastname: Zuin
authors.forename: Maria L
authors.initials: ML
authors.lastname: Costa
authors.forename: Antonio A
authors.initials: AA
authors.lastname: Dias
authors.forename: Alan
authors.initials: A
authors.lastname: Morris
authors.forename: Stefano
authors.initials: S
authors.lastname: Stranges
authors.forename: John M
authors.initials: JM
authors.lastname: Dyke