Gas Phase Oxygen Quenching Studies of Ketone Tracers for Laser-Induced Fluorescence Applications in Nitrogen Bath Gas

Shelar, VM and Hegde, GM and Umesh, G and Jagadeesh, G and Reddy, KPJ (2014) Gas Phase Oxygen Quenching Studies of Ketone Tracers for Laser-Induced Fluorescence Applications in Nitrogen Bath Gas. In: SPECTROSCOPY LETTERS, 47 (1). pp. 12-18.

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Abstract

In this paper we report the quantitative oxygen quenching effect on laser-induced fluorescence of acetone, methyl ethyl ketone, and 3-pentanone at low pressures (approximate to 700torr) with oxygen partial pressures up to 450torr. Nitrogen was used as a bath gas in which these molecular tracers were added in different quantities according to their vapor pressure at room temperature. These tracers were excited by using a frequency-quadrupled, Q-switched, Nd:YAG laser (266nm). Stern-Volmer plots were found to be linear for all the tracers, suggesting that quenching is collisional in nature. Stern-Volmer coefficients (k(sv)) and quenching rate constants (k(q)) were calculated from Stern-Volmer plots. The effects of oxygen on the laser-induced fluorescence of acetone, methyl ethyl ketone, and 3-pentanone were compared with each other. Further, the Smoluchowski theory was used to calculate the quenching parameters and compared with the experimental results.

Item Type:	Journal Article
Publication:	SPECTROSCOPY LETTERS
Publisher:	TAYLOR & FRANCIS INC
Additional Information:	copyright for this article belongs to TAYLOR & FRANCIS INC USA
Keywords:	diffusion coefficient; fluorescence quenching; ketones; LIF; oxygen
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	04 Dec 2013 11:44
Last Modified:	04 Dec 2013 11:44
URI:	http://eprints.iisc.ac.in/id/eprint/47877

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