Numerical results of enhancement
factor of vibrational Raman bands of molecules adsorbed on metal
colodoid spherical surface of copper, like a function of particle
radio, are presented. In the model used, the signal enhancement
comes of the superposition of the external electromagnetic field,
the Lorentz-Mie scattering field by the particle at same frecuency
of the external field, and Raman field emited by molecules at the
shifted Raman frecuency. Particle radii bettween 0 to 50 nm are
considered. Two stimulating wavelength lines are used: 382 and 532
nm. The 459 cm-1 of carbon tetrachlorine and 1010 cm-1 of piridine
Stokes bands are studied. |