ISSN:
0377-0486
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Micro-Raman spectra of picogram to sub-femtogram quantities of several chromophoric substances adsorbed from dilute solution on silver were measured and compared with similar measurements on some non-chromophoric substances. The silver surface enhanced resonance Raman measurements require no redox roughening of the surface, sometimes no applied potential and only 1-2 mW of defocused laser power. The new method by which silver surface enchancement is achieved requires contact of the surface with halide ion solution for several hours. The most astounding results thus far were achieved with 1, 1′-diethyl-2,2′-cyanine iodide (2,2′-cyanine). Raman spectra of the adsorbate from 20 ml of 1 × 10-17 M solution of the dye were measured using the method. Further characteristics of the phenomenon were obtained based on extensive Raman measurements on 2,2′-cyanine. Some further details resulting from these measurements are described.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jrs.1250261211
Permalink