High-Sensitivity Stark Spectroscopy Obtained by Surface Plasmon Resonance Measurement

• Published in: Analytical chemistry (Washington) Vol. 72; no. 17; pp. 4003 - 4008
• Main Authors: Wang, S, Boussaad, S, Wong, S, Tao, N. J
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.09.2000
• Subjects: Adsorption; Biochemistry; Chemistry; Electricity; Electrochemistry; Exact sciences and technology; General and physical chemistry; Molecules; Sensitivity and Specificity; Spectrum Analysis; Study of interfaces; Surface Plasmon Resonance - instrumentation; Surface Plasmon Resonance - methods; Electrode adsorption; Nickel Complexes; Nitrogen heterocycle; Organic ligand; Electrode electrolyte interface; Solid electrode; Stark effect; Transition metal Complexes; Experimental study; Surface plasmon; Macrocycle; Metallophthalocyanine; Adsorption structure; Resonance; Aqueous solution; Electric field effect; Zinc Complexes
• ISSN: 0003-2700; 1520-6882
• DOI: 10.1021/ac000504f

The effect (Stark effect) of an applied electric field on the electronic states of molecular adsorbates was studied by measuring surface plasmon resonance (SPR) as a function of the wavelength of the incident light that excites the SPR. Using the Kramers−Kronig relation, Stark spectra comparable to those obtained with conventional methods were extracted from the electric field-induced SPR angular shift for several organic adsorbates. Because this method relies on detecting the SPR angular shift that can be measured precisely, high-sensitivity Stark spectroscopy can be achieved. In addition, the adsorbate coverage information can be determined from the SPR angular shift upon molecular adsorption.