Vibrational spectroscopic evidence for (NO)3 formation on Cu(111)
H Koshida1, H Okuyama1, S Hatta1
1Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
The Journal of Chemical Physics
|August 8, 2016
Summary
Researchers confirmed the formation of nitrogen trioxide (NO)3 on copper surfaces using vibrational analysis. Isotopic labeling revealed distinct vibrational peaks, supporting the existence and structure of the (NO)3 trimer.
Area of Science:
- Surface science
- Chemical physics
- Spectroscopy
Background:
- Previous scanning tunneling microscopy studies suggested the formation of nitrogen trioxide (NO)3 on Cu(111).
- Further investigation was needed to spectroscopically confirm these findings and elucidate the structure of the adsorbed species.
Purpose of the Study:
- To verify the formation of (NO)3 on Cu(111) using electron energy loss spectroscopy (EELS).
- To analyze the vibrational properties of the (NO)3 trimer and determine its surface orientation.
Main Methods:
- Electron energy loss spectroscopy (EELS) was employed to study the vibrational modes of adsorbed species.
- Isotopic labeling with N(16)O and N(18)O was used to differentiate vibrational frequencies.
- Model calculations of coupled oscillators were performed to evaluate dynamic coupling.
Main Results:
- Four distinct N-O stretching vibration peaks were observed, corresponding to the four isotopic combinations of the (NO)3 trimer.
- Analysis of dynamic coupling provided insights into the interactions within the trimer.
- Observation of hindered rotation and translation modes indicated a tilted molecular axis relative to the surface normal.
Conclusions:
- The vibrational analysis provides strong spectroscopic evidence for the formation of (NO)3 on the Cu(111) surface.
- The findings support the existence of the nitrogen trioxide trimer and offer insights into its structure and orientation.
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