122nd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Analytical Chemists I
Room No. Room 321
Time THU 09:20-:
Code ANAL1.O-3
Subject Understanding mechanism of axially perpendicular offset scheme for minimization of glass background in the spectra of housed samples in glass bottles by Monte-Carlo simulation
Authors Duy Pham Khac, Tung Vu, Yoon Jeong Lee, Eunjin Jang1, Hoeil Chung*
Department of Chemistry, Hanyang University, Korea
1Chemistry, Hanyang University, Korea
Abstract When a laser beam is irradiated on a side of a sample-containing glass bottle, the generated glass Raman photons are expected to be more localized near the wall, while Raman photons of the sample are more widely distributed throughout the bottle. Interestingly, since bottom of a glass bottle is usually curved, it would be possible to generate conical-shaped field-of-view (FOV) for Raman photon detection, which would be beneficial to separate the localized glass Raman photons near the bottle wall from the wide-spread sample photons. In this case, axially perpendicular offset (APO) scheme incorporating an axially perpendicular geometrical arrangement between laser illumination and photon detection would be as a versatile tool for minimization of contributions of glass background in direct measurements of Raman spectra of samples contained in glass bottles. By using APO scheme, with a longer offset distance between laser illumination spot and detection; it could help further the FOV from localized glass Raman photons near the bottle wall and isolating the glass signal. In this study, Monte-Carlo simulation was applied to explain and visualize the mechanism of minimizing glass background in APO measurements by simulation Raman photon distribution in the samples. The FOVs for Raman photon detection were measured experimentally and simulated accordingly in each case. The results of this simulation were found to be accordant with the experimental observations.
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