title: Dynamics of oxygen Rydberg atom generation following O 1s inner-shell excitation of H₂O.
abstract: The emission of low-energy electrons from H2O has been investigated at photon excitation energies in the vicinity of the O 1s ionization threshold. Neutral oxygen Rydberg atoms (O*) were found to form, and the correlation between the initial inner-shell excited state of H2O and the Rydberg state of O* was determined. The initially excited electron in a Rydberg orbital is shown to remain associated with O* even after the cleavage of two O-H bonds. We also show that the energy discrepancy between two Rydberg states of H2O and O* can be explained by the influence of the post-collision interaction, which becomes stronger as the excitation energy approaches the 1s ionization threshold.
authors.affiliation: University of Hyogo, Koto 3-2-1, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Gejo
authors.affiliation: University of Hyogo, Koto 3-2-1, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ikegami
authors.affiliation: University of Hyogo, Koto 3-2-1, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Honma
authors.affiliation: Hiroshima University, 2-2 Kagamiyama 1-chome, Higashihiroshima 739-8512, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Takahashi
authors.affiliation: UVSOR Facility, Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Shigemasa
authors.affiliation: Department of Environmental Science, Niigata University, 8050, Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hikosaka
authors.affiliation: JASRI, Koto 1-1-1, Sayo-cho, Hyogo 679-5198, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tamenori