title: Ultrafast bond softening in bismuth: mapping a solid's interatomic potential with X-rays.
abstract: Intense femtosecond laser excitation can produce transient states of matter that would otherwise be inaccessible to laboratory investigation. At high excitation densities, the interatomic forces that bind solids and determine many of their properties can be substantially altered. Here, we present the detailed mapping of the carrier density-dependent interatomic potential of bismuth approaching a solid-solid phase transition. Our experiments combine stroboscopic techniques that use a high-brightness linear electron accelerator-based x-ray source with pulse-by-pulse timing reconstruction for femtosecond resolution, allowing quantitative characterization of the interatomic potential energy surface of the highly excited solid.
authors.affiliation: Frontiers in Optical Coherent and Ultrafast Science (FOCUS) Center, Departments of Physics and Applied Physics Program, University of Michigan, Ann Arbor, MI 48109, USA. dmfritz@slac.stanford.edu
authors.forename: D M
authors.initials: DM
authors.lastname: Fritz
authors.forename: D A
authors.initials: DA
authors.lastname: Reis
authors.forename: B
authors.initials: B
authors.lastname: Adams
authors.forename: R A
authors.initials: RA
authors.lastname: Akre
authors.forename: J
authors.initials: J
authors.lastname: Arthur
authors.forename: C
authors.initials: C
authors.lastname: Blome
authors.forename: P H
authors.initials: PH
authors.lastname: Bucksbaum
authors.forename: A L
authors.initials: AL
authors.lastname: Cavalieri
authors.forename: S
authors.initials: S
authors.lastname: Engemann
authors.forename: S
authors.initials: S
authors.lastname: Fahy
authors.forename: R W
authors.initials: RW
authors.lastname: Falcone
authors.forename: P H
authors.initials: PH
authors.lastname: Fuoss
authors.forename: K J
authors.initials: KJ
authors.lastname: Gaffney
authors.forename: M J
authors.initials: MJ
authors.lastname: George
authors.forename: J
authors.initials: J
authors.lastname: Hajdu
authors.forename: M P
authors.initials: MP
authors.lastname: Hertlein
authors.forename: P B
authors.initials: PB
authors.lastname: Hillyard
authors.forename: M
authors.initials: M
authors.lastname: Horn-von Hoegen
authors.forename: M
authors.initials: M
authors.lastname: Kammler
authors.forename: J
authors.initials: J
authors.lastname: Kaspar
authors.forename: R
authors.initials: R
authors.lastname: Kienberger
authors.forename: P
authors.initials: P
authors.lastname: Krejcik
authors.forename: S H
authors.initials: SH
authors.lastname: Lee
authors.forename: A M
authors.initials: AM
authors.lastname: Lindenberg
authors.forename: B
authors.initials: B
authors.lastname: McFarland
authors.forename: D
authors.initials: D
authors.lastname: Meyer
authors.forename: T
authors.initials: T
authors.lastname: Montagne
authors.forename: E D
authors.initials: ED
authors.lastname: Murray
authors.forename: A J
authors.initials: AJ
authors.lastname: Nelson
authors.forename: M
authors.initials: M
authors.lastname: Nicoul
authors.forename: R
authors.initials: R
authors.lastname: Pahl
authors.forename: J
authors.initials: J
authors.lastname: Rudati
authors.forename: H
authors.initials: H
authors.lastname: Schlarb
authors.forename: D P
authors.initials: DP
authors.lastname: Siddons
authors.forename: K
authors.initials: K
authors.lastname: Sokolowski-Tinten
authors.forename: Th
authors.initials: T
authors.lastname: Tschentscher
authors.forename: D
authors.initials: D
authors.lastname: von der Linde
authors.forename: J B
authors.initials: JB
authors.lastname: Hastings