Dissociation of water on oxygen-covered Rh{111}
(2009) In Journal of Chemical Physics 131(21).- Abstract
- The adsorption of water and coadsorption with oxygen on Rh{111} under ultrahigh vacuum conditions was studied using synchrotron-based photoemission and photoabsorption spectroscopy. Water adsorbs intact on the clean surface at temperatures below 154 K. Irradiation with x-rays, however, induces fast dissociation and the formation of a mixed OH+H2O layer indicating that the partially dissociated layer is thermodynamically more stable. Coadsorption of water and oxygen at a coverage below 0.3 monolayers has a similar effect, leading to the formation of a hydrogen-bonded network of water and hydroxyl molecules at a ratio of 3:2. The partially dissociated layers are more stable than chemisorbed intact water with the maximum desorption... (More)
- The adsorption of water and coadsorption with oxygen on Rh{111} under ultrahigh vacuum conditions was studied using synchrotron-based photoemission and photoabsorption spectroscopy. Water adsorbs intact on the clean surface at temperatures below 154 K. Irradiation with x-rays, however, induces fast dissociation and the formation of a mixed OH+H2O layer indicating that the partially dissociated layer is thermodynamically more stable. Coadsorption of water and oxygen at a coverage below 0.3 monolayers has a similar effect, leading to the formation of a hydrogen-bonded network of water and hydroxyl molecules at a ratio of 3:2. The partially dissociated layers are more stable than chemisorbed intact water with the maximum desorption temperatures up to 30 K higher. For higher oxygen coverage, up to 0.5 monolayers, water does not dissociate and an intact water species is observed above 160 K, which is characterized by an O 1s binding energy 0.6 eV higher than that of chemisorbed water and a high desorption temperature similar to the partially dissociated layer. The extra stabilization is most likely due to hydrogen bonds with atomic oxygen. (C) 2009 American Institute of Physics. [doi:10.1063/1.3266941] (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1533483
- author
- Shavorskiy, A.
; Eralp, T.
; Ataman, Evren
LU
; Isvoranu, Cristina
LU
; Schnadt, Joachim
LU
; Andersen, Jesper N LU and Held, G.
- organization
- publishing date
- 2009
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Chemical Physics
- volume
- 131
- issue
- 21
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- wos:000272494300032
- scopus:72049122683
- ISSN
- 0021-9606
- DOI
- 10.1063/1.3266941
- language
- English
- LU publication?
- yes
- id
- 49c5bef0-6567-4617-9a58-0142dd961160 (old id 1533483)
- date added to LUP
- 2016-04-01 12:36:45
- date last changed
- 2022-02-23 02:17:13
@article{49c5bef0-6567-4617-9a58-0142dd961160, abstract = {{The adsorption of water and coadsorption with oxygen on Rh{111} under ultrahigh vacuum conditions was studied using synchrotron-based photoemission and photoabsorption spectroscopy. Water adsorbs intact on the clean surface at temperatures below 154 K. Irradiation with x-rays, however, induces fast dissociation and the formation of a mixed OH+H2O layer indicating that the partially dissociated layer is thermodynamically more stable. Coadsorption of water and oxygen at a coverage below 0.3 monolayers has a similar effect, leading to the formation of a hydrogen-bonded network of water and hydroxyl molecules at a ratio of 3:2. The partially dissociated layers are more stable than chemisorbed intact water with the maximum desorption temperatures up to 30 K higher. For higher oxygen coverage, up to 0.5 monolayers, water does not dissociate and an intact water species is observed above 160 K, which is characterized by an O 1s binding energy 0.6 eV higher than that of chemisorbed water and a high desorption temperature similar to the partially dissociated layer. The extra stabilization is most likely due to hydrogen bonds with atomic oxygen. (C) 2009 American Institute of Physics. [doi:10.1063/1.3266941]}}, author = {{Shavorskiy, A. and Eralp, T. and Ataman, Evren and Isvoranu, Cristina and Schnadt, Joachim and Andersen, Jesper N and Held, G.}}, issn = {{0021-9606}}, language = {{eng}}, number = {{21}}, publisher = {{American Institute of Physics (AIP)}}, series = {{Journal of Chemical Physics}}, title = {{Dissociation of water on oxygen-covered Rh{111}}}, url = {{http://dx.doi.org/10.1063/1.3266941}}, doi = {{10.1063/1.3266941}}, volume = {{131}}, year = {{2009}}, }