By the use of an ATR technique we have found that the infrared absorption of p-nitrobenzoate, formed on Ag island film about 5 nm thick, is enhanced by a factor of the order of 10. Only vibrational modes involving a change in the dipole moment of the benzoate ion perpendicular to the macroscopic Ag surface are enhanced by p-polarized radiation alone, indicating the electric field of the evanescent wave polarized perpendicular to the Ag surface plays a dominant role in the infrared excitation process. A monolayer of stearic acid deposited on a Ag underlayer 5nm thick gave another example of the enhancement. Although the mechanism of enhancement is not fully elucidated, the existing model based on the collective electron resonances of Ag islands is not applicable to the present case, since it predicts the electron resonance can be excited irrespective of polarization state of infrared beam.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
C.Y. Chen, I. Davoli, G. Ritchie, E. Burstein: Surf. Sci.101, 363 (1980)
M. Moskovits: J. Chem. Phys.69, 4159 (1978)
R. Dornhaus, R.E. Benner, R.K. Chang, I. Chabay: Surf. Sci.101, 367 (1980)
A. Hartstein, J.R. Kirtley, J.C. Tsang: Phys. Rev. Lett.45, 201 (1980)
N.J. Harrick:Internal Reflection Spectroscopy (Interscience, New York 1967)
N.B. Colthup, L.H. Daly, S.E. Wiberley:Introduction to Infrared and Roman Spectroscopy (Academic Press, New York 1964)
D. Hadži, N. Sheppard: Proc. Roy. Soc. A216, 247 (1953)
K.B. Blodgett: J. Am. Chem. Soc.57, 1007 (1935)
See for example, P. Hollins, J. Pritchard: InVibrational Spectroscopy of Adsorbates, ed. by R.F. Willis (Springer, Berlin, Heidelberg, New York 1980) p. 125
T. Yamaguchi, S. Yoshida, A. Kinbara: Thin Solid Films21, 173 (1974)
About this article
Cite this article
Hatta, A., Ohshima, T. & Suëtaka, W. Observation of the enhanced infrared absorption of p-nitrobenzoate on Ag island films with an ATR technique. Appl. Phys. A 29, 71–75 (1982). https://doi.org/10.1007/BF00632429