Surface-enhanced hyper-Raman scattering (SEHRS) and surface-enhanced Raman scattering (SERS) by means of mode-locked Ti:sapphire laser excitation

Surface-enhanced hyper-Raman scattering (SEHRS) and surface-enhanced Raman scattering (SERS) using mode-locked Ti:sapphire laser excitation is reported. SEHRS and SERS from crystal violet molecules on colloidal silver were measured using 1 ps laser pulses (82 MHz repetition rate, 1.2 W average power...

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Bibliographic Details
Published in:Chemical physics letters 1993-09, Vol.212 (3), p.374-378
Main Authors: Kneipp, H., Kneipp, K., Seifert, F.
Format: Article
Language:English
Subjects:
Adsorbents
Chemistry
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
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Summary:Surface-enhanced hyper-Raman scattering (SEHRS) and surface-enhanced Raman scattering (SERS) using mode-locked Ti:sapphire laser excitation is reported. SEHRS and SERS from crystal violet molecules on colloidal silver were measured using 1 ps laser pulses (82 MHz repetition rate, 1.2 W average power) at 800 nm wavelength excitation. This 800 nm excitation allowed simultaneous observation of SEHRS and SERS and a direct comparison of surface-enhancement factors for Raman scattering and hyper-Raman scattering. The ratio between the surface-enhancement factors of SERS and SEHRS for crystal violet on colloidal silver could be explained by different electromagnetic-enhancement conditions for both effects. No evidence exists of different chemical contributions to SERS and SEHRS for this molecule.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(93)89340-N