Molecular orientation change during adsorption of NO and N 2O on Ir(111) observed by real-time wavelength-dispersive x-ray absorption spectroscopy with polarization switching

Kenta Amemiya, Masako Sakamaki, Shuichi Nakamoto, Masaaki Yoshida, Kazuma Suzuki, Hiroshi Kondoh, Tsuneharu Koide, Kenji Ito, Kimichika Tsuchiya, Kentaro Harada, Hiroyuki Sasaki, Tomohiro Aoto, Tatsuro Shioya, Takashi Obina, Shigeru Yamamoto, Yukinori Kobayashi

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Abstract

The molecular orientation of NO and N 2O during adsorption on Ir(111) is observed by combining the wavelength-dispersive x-ray absorption spectroscopy with 1 Hz switching between the vertical and horizontal linear polarizations. It is revealed that NO adsorbs keeping its molecular axis at ∼ 20 ° from surface normal. In contrast, N 2O rapidly adsorbs up to 2/3 of the saturation coverage with an orientation angle of ∼ 35°, then turns to a slow adsorption phase with larger orientation angles, and gradually reaches its saturation with an average orientation angle of ∼ 45 °. Such a complicated behavior is interpreted by assuming different adsorption sites.

Original languageEnglish
Article number161601
JournalApplied Physics Letters
Volume101
Issue number16
DOIs
Publication statusPublished - 2012 Oct 15

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Amemiya, K., Sakamaki, M., Nakamoto, S., Yoshida, M., Suzuki, K., Kondoh, H., Koide, T., Ito, K., Tsuchiya, K., Harada, K., Sasaki, H., Aoto, T., Shioya, T., Obina, T., Yamamoto, S., & Kobayashi, Y. (2012). Molecular orientation change during adsorption of NO and N 2O on Ir(111) observed by real-time wavelength-dispersive x-ray absorption spectroscopy with polarization switching. Applied Physics Letters, 101(16), [161601]. https://doi.org/10.1063/1.4759114