Journal Article

PHPPUBDB-23710

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Photolysis of water-radical ions $\mathrm{H_2O^+}$ in the xuv: Fragmentation through dicationic states

Pedersen, H. B. (Corresponding author) ; Domesle, C. ; Lammich, L. ; Dziarzhytski, S. ; Guerassimova, N. ; Treusch, R. ; Harbo, L. S. ; Heber, O. ; Jordon-Thaden, B. ; Arion, T. ; Förstel, M. ; Stier, M. ; Hergenhahn, U. ; Wolf, A. ; DESY

2013
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevA.87.013402  doi:10.3204/PHPPUBDB-23710

Abstract: The photofragmentation of the water cation $H_2O^+$ through dicationic states has been studied at 35.0 ± 0.2 nm (35.4 ± 0.3 eV) and 21.8 ± 0.2 nm (56.8 ± 0.5 eV) with a crossed ion-photon beams experiment at the free electron laser FLASH. The dissociation of the dications is found to be similar at the two wavelengths and to proceed into $O^0 + 2H^+$, $OH^+ + H^+$, and $O^+ + H_2^+$, with determined ratios $\sigma_{OH^+ + H^+}/\sigma_{O^+ + H_2^+}$= 4.2 ±0.3 and $\sigma_{OH^+ + H^+}/\sigma_{O^+ + 2H^+}$>0.7. The measured kinetic-energy releases for these processes are consistent with three-body breakup ($O^0+2H^+$) occurring mainly through the $2^3A''$ and $2^1A''$ states of $H_2O_2^+$ and two-body breakup ($OH^+ + H^+$) occurring through $X^3A''$, $1^3A′$, and $1^1A''$ states of $H_2O_2^+$, as predicted in a recent theoretical study [Gervais et al., J. Chem. Phys. 131, 024302 (2009)]. In addition to the kinetic-energy releases, we also report on fragment correlation in the three-body channel where the two protons carry the major part of the released momentum.

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Contributing Institute(s):

1. Experiments with synchrotron radiation (HASYLAB(-2012))

Research Program(s):

1. FLASH Beamline PG2 (POF2-54G16) (POF2-54G16)

Experiment(s):

1. FLASH Beamline PG2 (FLASH)

Appears in the scientific report 2013

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Database coverage:
; No Author Disambiguation

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