title: Molecular dynamics of NH3 induced by core-electron excitation.
abstract: Nuclear motion in the N1s(-1)4a core-excited state of ammonia is investigated by studying the angular anisotropy of fragments produced in the decay of the highly excited molecule and compared with predictions from ab initio calculations. Two different fragmentation channels (H(+)/NH2(+) and H(+)/NH(+)/H) reveal complex nuclear dynamics as the excitation photon energy is tuned through the 4a1 resonance. The well-defined angular anisotropy of the fragments produced in the dissociation of the molecular dication species suggests a very rapid nuclear motion and the time scale of the nuclear dynamics is limited to the low fs timescale.
authors.affiliation: Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118, 22100 Lund, Sweden. noelle.walsh@sljus.lu.se.
authors.forename: Noelle
authors.initials: N
authors.lastname: Walsh
authors.forename: Anna
authors.initials: A
authors.lastname: Sankari
authors.forename: Joakim
authors.initials: J
authors.lastname: Laksman
authors.forename: Tomas
authors.initials: T
authors.lastname: Andersson
authors.forename: Shabnam
authors.initials: S
authors.lastname: Oghbaie
authors.forename: Feras
authors.initials: F
authors.lastname: Afaneh
authors.forename: Erik P
authors.initials: EP
authors.lastname: Månsson
authors.forename: Mathieu
authors.initials: M
authors.lastname: Gisselbrecht
authors.forename: Stacey L
authors.initials: SL
authors.lastname: Sorensen