CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study Научная публикация
Журнал |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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Вых. Данные | Год: 2016, Том: 120, Номер: 20, Страницы: 10838-10848 Страниц : 11 DOI: 10.1021/acs.jpcc.5b12494 | ||||||
Ключевые слова | Absorption spectroscopy; Adsorbates; Adsorption; Carbon dioxide; Desorption; Electrons; Low energy electron diffraction; Single crystals; Surface treatment; Temperature programmed desorption | ||||||
Авторы |
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Организации |
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Реферат:
Clean and stable surface modifications of an iridium (100) single crystal, i.e., the (1 × 1) phase, the (5 × 1) reconstruction, and the oxygen-terminated (2 × 1)-O surface, were prepared and characterized by low energy electron diffraction (LEED), temperature-programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and polarization modulation IRAS (PM-IRAS). The adsorption of CO in UHV and at elevated (mbar) pressure/temperature was followed both ex situ and in situ on all three surface modifications, with a focus on mbar pressures of CO. The Ir(1 × 1) surface exhibited c(4 × 2)/c(2 × 2) and c(6 × 2) CO structures under low pressure conditions, and remained stable up to 100 mbar and 700 K. For the (2 × 1)-O reconstruction CO adsorption induced a structural change from (2 × 1)-O to (1 × 1), as confirmed by LEED, TPD, and IR. For Ir (2 × 1)-O TPD indicated that CO reacted with surface oxygen forming CO2. The (5 × 1) reconstruction featured a reversible and dynamic behavior upon CO adsorption, with a local lifting of the reconstruction to (1 × 1). After CO desorption, the (5 × 1) structure was restored. All three reconstructions exhibited CO adsorption with on-top geometry, as evidenced by IR. With increasing CO exposure the resonances shifted to higher wavenumber, due to adsorbate–adsorbate and adsorbate–substrate interactions. The largest wavenumber shift (from 2057 to 2100 cm–1) was observed for Ir(5 × 1) upon CO dosing from 1 L to 100 mbar.
Библиографическая ссылка:
Anic K.
, Bukhtiyarov A.V.
, Li H.
, Rameshan C.
, Rupprechter G.
CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study
The Journal of Physical Chemistry C. 2016. V.120. N20. P.10838-10848. DOI: 10.1021/acs.jpcc.5b12494 WOS Scopus РИНЦ CAPlusCA PMID OpenAlex
CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study
The Journal of Physical Chemistry C. 2016. V.120. N20. P.10838-10848. DOI: 10.1021/acs.jpcc.5b12494 WOS Scopus РИНЦ CAPlusCA PMID OpenAlex
Файлы:
Полный текст от издателя
Даты:
Поступила в редакцию: | 21 дек. 2015 г. |
Принята к публикации: | 21 апр. 2016 г. |
Опубликована online: | 17 мая 2016 г. |
Опубликована в печати: | 26 мая 2016 г. |
Идентификаторы БД:
Web of science: | WOS:000376840900011 |
Scopus: | 2-s2.0-84971383923 |
РИНЦ: | 27060591 |
Chemical Abstracts: | 2016:646826 |
Chemical Abstracts (print): | 164:563708 |
PMID (PubMed): | 27257467 |
OpenAlex: | W2336035267 |