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Axially perpendicular offset scheme for obtaining Raman spectra of housed samples in glass bottles with minimized glass-peak background

Abstract

An axially perpendicular offset (APO) scheme based on an axially perpendicular geometrical arrangement of laser illumination and photon detection, enabling spatially offset Raman spectroscopy (SORS), is proposed as a versatile tool for minimization of the glass background in direct measurements of Raman spectra of samples housed in glass bottles. This strategy is based on the possibility of isolating glass photons from sample photons by properly locating a detector beneath the sample-housing bottle, because glass photons are much more localized near the glass wall while sample photons are widely distributed throughout the bottle. In addition, the curved bottom of glass vial enabling of forming the conical photon-detection volume would be further effective for exclusion of the glass photons in acquisition of sample spectra. The APO scheme was validated by measuring the Raman spectra of 66% ethanol housed in four glass bottles of different sizes and colors; the measurements were performed by varying the offset distance from 2 mm to 20 mm. The intensity of the glass background decreased rapidly with increasing the offset distance; on the other hand, the variation in the ethanol intensity was relatively insignificant. In all cases, the offset distance of 16 mm minimized the presence of glass background in the spectra, thereby helping to highlight the pure ethanol bands and producing nearly similar sample spectral features regardless of contained bottles. The results of a Monte Carlo simulation were accordant with the experimental observations, and suppression of glass photons in the APO scheme was clearly explained and visualized by the simulation.

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Supplementary files

Publication details

The article was received on 20 Jul 2018, accepted on 11 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8AN01344F
Citation: Analyst, 2018, Accepted Manuscript
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    Axially perpendicular offset scheme for obtaining Raman spectra of housed samples in glass bottles with minimized glass-peak background

    P. K. Duy, T. D. Vu, K. Chang and H. Chung, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN01344F

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