Dipole forbidden vibrational modes for NO and CO on Cu observed in the far IR

Hirschmugl, Carol J.; Dumas, Paul; Chabal, Yves J.; Hoffmann, F. M.; Suhren, M.; Williams, Gwyn

doi:10.1016/0368-2048(93)80062-q

Cited by 25 publications

(5 citation statements)

References 21 publications

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“…They were able to observe an anti-absorption band in their infrared spectrum which could be attributed to the dipole-forbidden hindered rotation of the NO molecule. This is the only example of the observation of a dipole forbidden mode for NO adsorption, although the same workers have made similar observations for CO adsorption. − The theory of this process has been discussed. − N 2 O forms at high coverages of NO, and (NO) 2 is formed at even higher coverages (greater than one monolayer). Again it was assumed that N 2 O formation occurred via the (NO) 2 dimer reaction pathway.…”

Section: Dimers and Their Reactionsmentioning

confidence: 70%

NO Chemisorption and Reactions on Metal Surfaces: A New Perspective

2000

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NO adsorption on metal surfaces has been studied extensively due to its important role in many catalytic processes. In the past, it was recognized that the tendency for a metal surface to dissociate NO depends on its position in the periodic table, but little was understood about the dissociation process itself. Recent experimental and theoretical studies have shown that this view is oversimplified. In addition to the distinction between molecular and dissociative adsorption on surfaces, the structure of NO on metal surfaces has also been the subject of detailed study and debate. It is therefore timely to update our ideas about NO adsorption and reactivity. Here we examine the structure of NO on surfaces, in particular the break-down of vibrational assignments and we look at how these assignments can be improved. The NO dissociation process is also discussed along with the formation, and reactions, of the NO dimer, (NO) 2 , on some metal surfaces.

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Section: Dimers and Their Reactionsmentioning

confidence: 70%

NO Chemisorption and Reactions on Metal Surfaces: A New Perspective

2000

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“…One can clearly see the antiabsorption (Fano line shape) feature that has been assigned to the frustrated rotation of CO, 43 as well as the shape of the reflectance change. Such antiabsorption modes have also been observed for H/Cu(111), 132,133 K/Cu (111) 134 and C60/Ag(111). 135 Fig.…”

Section: Low Frequency Modes and Frictionmentioning

confidence: 68%

Molecules at Surfaces and Interfaces Studied Using Vibrational Spectroscopies and Related Techniques

Dumas

Weldon²,

Chabal³

et al. 1999

Surf. Rev. Lett.

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Recent developments in the major experimental vibrational-spectroscopic techniques (i.e. infrared absorption, Raman scattering, high resolution electron loss, helium atom scattering and sum frequency generation) are reviewed and illustrated with selected results. Particular emphasis is given to two important topics which have attracted much attention in recent years: (i) the complex surface reactions taking place on technologically relevant surfaces and interfaces, and (ii) vibrational dynamics with emphasis on energy dissipation at surfaces.

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“…The latter explanation does not involve dipolar transition but states that the infrared absorption may result mainly from the parallel component of the dynamic dipole moment. This can originate either from a discrete electronic surface state in the vicinity of the frequency region, or from the anomalous skin effect [23][24][25].…”

Section: Resultsmentioning

confidence: 99%

Vibrational spectroscopy of and K-doped on Ag(111) by sum-frequency generation

Caudano¹,

Péremans²,

Thiry³

et al. 1996

J. Phys. B: At. Mol. Opt. Phys.

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The C 60 /Ag(111) interface and the completely doped K/C 60 /Ag(111) interface were studied by infrared reflection absorption (IRAS) and infrared-visible sum-frequency generation (SFG) spectroscopies. The combination of both techniques provides a powerful means for the determination of the infrared and/or Raman character of the adsorbate vibrations. Accordingly, we show that the vibration observed by IRAS in the 1100-1500 cm −1 frequency range for the C 60 /Ag(111) interface is the A g (2) 'pentagonal pinch' mode of C 60 , which is Raman active and infrared silent in the free molecule. We also observe vibrational frequency and infrared intensity modification of the normally Raman active A g (2) and infrared active T 1u (4) modes upon K-doping.

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Dipole forbidden vibrational modes for NO and CO on Cu observed in the far IR

Cited by 25 publications

References 21 publications

NO Chemisorption and Reactions on Metal Surfaces: A New Perspective

NO Chemisorption and Reactions on Metal Surfaces: A New Perspective

Molecules at Surfaces and Interfaces Studied Using Vibrational Spectroscopies and Related Techniques

Vibrational spectroscopy of and K-doped on Ag(111) by sum-frequency generation

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