title: Dynamics of hollow atom formation in intense x-ray pulses probed by partial covariance mapping.
abstract: When exposed to ultraintense x-radiation sources such as free electron lasers (FELs) the innermost electronic shell can efficiently be emptied, creating a transient hollow atom or molecule. Understanding the femtosecond dynamics of such systems is fundamental to achieving atomic resolution in flash diffraction imaging of noncrystallized complex biological samples. We demonstrate the capacity of a correlation method called "partial covariance mapping" to probe the electron dynamics of neon atoms exposed to intense 8 fs pulses of 1062 eV photons. A complete picture of ionization processes competing in hollow atom formation and decay is visualized with unprecedented ease and the map reveals hitherto unobserved nonlinear sequences of photoionization and Auger events. The technique is particularly well suited to the high counting rate inherent in FEL experiments.
authors.affiliation: Blackett Laboratory, Imperial College London, London, United Kingdom. l.j.frasinski@imperial.ac.uk
authors.forename: L J
authors.initials: LJ
authors.lastname: Frasinski
authors.forename: V
authors.initials: V
authors.lastname: Zhaunerchyk
authors.forename: M
authors.initials: M
authors.lastname: Mucke
authors.forename: R J
authors.initials: RJ
authors.lastname: Squibb
authors.forename: M
authors.initials: M
authors.lastname: Siano
authors.forename: J H D
authors.initials: JH
authors.lastname: Eland
authors.forename: P
authors.initials: P
authors.lastname: Linusson
authors.forename: P
authors.initials: P
authors.lastname: v d Meulen
authors.forename: P
authors.initials: P
authors.lastname: Salén
authors.forename: R D
authors.initials: RD
authors.lastname: Thomas
authors.forename: M
authors.initials: M
authors.lastname: Larsson
authors.forename: L
authors.initials: L
authors.lastname: Foucar
authors.forename: J
authors.initials: J
authors.lastname: Ullrich
authors.forename: K
authors.initials: K
authors.lastname: Motomura
authors.forename: S
authors.initials: S
authors.lastname: Mondal
authors.forename: K
authors.initials: K
authors.lastname: Ueda
authors.forename: T
authors.initials: T
authors.lastname: Osipov
authors.forename: L
authors.initials: L
authors.lastname: Fang
authors.forename: B F
authors.initials: BF
authors.lastname: Murphy
authors.forename: N
authors.initials: N
authors.lastname: Berrah
authors.forename: C
authors.initials: C
authors.lastname: Bostedt
authors.forename: J D
authors.initials: JD
authors.lastname: Bozek
authors.forename: S
authors.initials: S
authors.lastname: Schorb
authors.forename: M
authors.initials: M
authors.lastname: Messerschmidt
authors.forename: J M
authors.initials: JM
authors.lastname: Glownia
authors.forename: J P
authors.initials: JP
authors.lastname: Cryan
authors.forename: R N
authors.initials: RN
authors.lastname: Coffee
authors.forename: O
authors.initials: O
authors.lastname: Takahashi
authors.forename: S
authors.initials: S
authors.lastname: Wada
authors.forename: M N
authors.initials: MN
authors.lastname: Piancastelli
authors.forename: R
authors.initials: R
authors.lastname: Richter
authors.forename: K C
authors.initials: KC
authors.lastname: Prince
authors.forename: R
authors.initials: R
authors.lastname: Feifel