Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10557600 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2005 | 4 Pages |
Abstract
A weak visible absorption spectrum of p-benzoquinone (p-BQ) in CS2 due to n-Ï* singlet-triplet transition was measured. Using the resonance Raman (RR) effect in liquid-core optical fiber (LCOF), we have obtained the 514.5Â nm excited RR spectra of p-benzoquinone near 1445Â cmâ1 and have demonstrated that the new characteristic RR band is attributed to the symmetric Cî
O stretch (νCî
O) of n-Ï* singlet-triplet transition of p-BQ. The effect of solution concentration on the RR band was investigated at very low concentrations. The RR peak spreads toward short wavelength side with decreasing solution concentration ranging from 10â7 to 10â11 mol Lâ1, whereas the blue-shift isn't obvious when the concentration is, at single molecule level, lower than 10â11 mol Lâ1. Our result is useful for single molecule detection to some extent.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Jian-Hua Yin, Zuo-Wei Li,