Photoionization and fragmentation of H3O+ under XUV irradiation

C. Domesle; S. Dziarzhytski; N. Guerassimova; Lasse Sloth Harbo; O. Heber; Lutz Lammich; B. Jordan-Thaden; R. Treusch; A. Wolf; Henrik B. Pedersen

doi:10.1103/PhysRevA.88.043405

Photoionization and fragmentation of H₃O⁺under XUV irradiation

C. Domesle, S. Dziarzhytski, N. Guerassimova, Lasse Sloth Harbo, O. Heber, Lutz Lammich, B. Jordan-Thaden, R. Treusch, A. Wolf, Henrik B. Pedersen

Department of Physics and Astronomy

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

Abstract

The photolysis of the hydronium cation H₃O⁺ has been studied at the extreme ultraviolet wavelengths of 35.56±0.24 nm (34.87±0.24 eV) and 21.85±0.17 nm (56.74±0.44 eV) using a crossed ion-photon beam setup at the free-electron laser FLASH. Coincidence photoelectron and photofragment spectroscopy was performed at 21.85 nm, where both inner and outer valence ionization are allowed, and revealed that the XUV photolysis of H₃O⁺ is by far dominated by ionization of outer valence electrons forming the ¹A₁ and ²E states of the dication H₃O²⁺. The dications were found to dissociate into the channels H₂O⁺+H⁺ (72±4%), OH⁰+2H⁺ (18±6%), and OH⁺+H⁺+H⁰ (10±1%). A kinematic analysis of the H₂O⁺+H⁺ channel after photoabsorption at 35.56 nm (where only outer valence ionization is possible) showed dissociation into excited states of the water radical ion, where the ¹A₁ state breaks up into the linear A^{̃ 2}A₁ state of H₂O⁺ and the ²E state decays into the strongly bent B̃²B₂ state. Finally, from the ²E state of H₃O²⁺, dissociation into OH⁰(X ²Π)+2H⁺ was identified to occur with a near linear dissociation geometry.

Original language	English
Journal	Physical Review A
Volume	88
Issue	4
Number of pages	12
ISSN	2469-9926
DOIs	https://doi.org/10.1103/PhysRevA.88.043405
Publication status	Published - 4 Oct 2013

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10.1103/PhysRevA.88.043405

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@article{f5a01801b8e44f089a34bdf22b1710f5,

title = "Photoionization and fragmentation of H3O+ under XUV irradiation",

abstract = "The photolysis of the hydronium cation H3O+ has been studied at the extreme ultraviolet wavelengths of 35.56±0.24 nm (34.87±0.24 eV) and 21.85±0.17 nm (56.74±0.44 eV) using a crossed ion-photon beam setup at the free-electron laser FLASH. Coincidence photoelectron and photofragment spectroscopy was performed at 21.85 nm, where both inner and outer valence ionization are allowed, and revealed that the XUV photolysis of H3O+ is by far dominated by ionization of outer valence electrons forming the 1A1 and 2E states of the dication H3O2+. The dications were found to dissociate into the channels H2O++H+ (72±4%), OH0+2H+ (18±6%), and OH++H++H0 (10±1%). A kinematic analysis of the H2O++H+ channel after photoabsorption at 35.56 nm (where only outer valence ionization is possible) showed dissociation into excited states of the water radical ion, where the 1A1 state breaks up into the linear {\~A} 2A1 state of H2O+ and the 2E state decays into the strongly bent {\~B} 2B2 state. Finally, from the 2E state of H3O2+, dissociation into OH0(X 2Π)+2H+ was identified to occur with a near linear dissociation geometry.",

author = "C. Domesle and S. Dziarzhytski and N. Guerassimova and Harbo, {Lasse Sloth} and O. Heber and Lutz Lammich and B. Jordan-Thaden and R. Treusch and A. Wolf and Pedersen, {Henrik B.}",

year = "2013",

month = oct,

day = "4",

doi = "10.1103/PhysRevA.88.043405",

language = "English",

volume = "88",

journal = "Physical Review A",

issn = "2469-9926",

publisher = "American Physical Society",

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TY - JOUR

T1 - Photoionization and fragmentation of H3O+ under XUV irradiation

AU - Domesle, C.

AU - Dziarzhytski, S.

AU - Guerassimova, N.

AU - Harbo, Lasse Sloth

AU - Heber, O.

AU - Lammich, Lutz

AU - Jordan-Thaden, B.

AU - Treusch, R.

AU - Wolf, A.

AU - Pedersen, Henrik B.

PY - 2013/10/4

Y1 - 2013/10/4

N2 - The photolysis of the hydronium cation H3O+ has been studied at the extreme ultraviolet wavelengths of 35.56±0.24 nm (34.87±0.24 eV) and 21.85±0.17 nm (56.74±0.44 eV) using a crossed ion-photon beam setup at the free-electron laser FLASH. Coincidence photoelectron and photofragment spectroscopy was performed at 21.85 nm, where both inner and outer valence ionization are allowed, and revealed that the XUV photolysis of H3O+ is by far dominated by ionization of outer valence electrons forming the 1A1 and 2E states of the dication H3O2+. The dications were found to dissociate into the channels H2O++H+ (72±4%), OH0+2H+ (18±6%), and OH++H++H0 (10±1%). A kinematic analysis of the H2O++H+ channel after photoabsorption at 35.56 nm (where only outer valence ionization is possible) showed dissociation into excited states of the water radical ion, where the 1A1 state breaks up into the linear Ã 2A1 state of H2O+ and the 2E state decays into the strongly bent B̃ 2B2 state. Finally, from the 2E state of H3O2+, dissociation into OH0(X 2Π)+2H+ was identified to occur with a near linear dissociation geometry.

AB - The photolysis of the hydronium cation H3O+ has been studied at the extreme ultraviolet wavelengths of 35.56±0.24 nm (34.87±0.24 eV) and 21.85±0.17 nm (56.74±0.44 eV) using a crossed ion-photon beam setup at the free-electron laser FLASH. Coincidence photoelectron and photofragment spectroscopy was performed at 21.85 nm, where both inner and outer valence ionization are allowed, and revealed that the XUV photolysis of H3O+ is by far dominated by ionization of outer valence electrons forming the 1A1 and 2E states of the dication H3O2+. The dications were found to dissociate into the channels H2O++H+ (72±4%), OH0+2H+ (18±6%), and OH++H++H0 (10±1%). A kinematic analysis of the H2O++H+ channel after photoabsorption at 35.56 nm (where only outer valence ionization is possible) showed dissociation into excited states of the water radical ion, where the 1A1 state breaks up into the linear Ã 2A1 state of H2O+ and the 2E state decays into the strongly bent B̃ 2B2 state. Finally, from the 2E state of H3O2+, dissociation into OH0(X 2Π)+2H+ was identified to occur with a near linear dissociation geometry.

U2 - 10.1103/PhysRevA.88.043405

DO - 10.1103/PhysRevA.88.043405

M3 - Journal article

SN - 2469-9926

VL - 88

JO - Physical Review A

JF - Physical Review A

IS - 4

ER -