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Dynamics of atomic adsorbates: hydrogen on Cu(111)

✍ Scribed by C.L.A. Lamont; B.N.J. Persson; G.P. Williams

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
460 KB
Volume
243
Category
Article
ISSN
0009-2614

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✦ Synopsis

We have measured the absolute changes induced in the far infrared reflectivity by H and D atoms adsorbed on Cu(lll). The strongest features in the spectra are the dipole forbidden parallel vibrational modes which give rise to anti-absorption peaks with an intensity almost 10 times higher than that of the dipole allowed perpendicular modes. The dynamics can be explained by excitation of electron-hole pairs in the substrate. The energy relaxation time of the parallel vibration is 1 ps, but the linewidth is larger by a factor of 10 probably due to lateral tunneling of the adsorbates and dephasing processes.

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