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Title:LINEAR AND NON-LINEAR THERMAL LENS SIGNAL OF THE FIFTH C-H VIBRATIONAL OVERTONE OF NAPHTHALENE IN LIQUID SOLUTIONS OF HEXANE
Author(s):Manzanares, Carlos
Contributor(s):Nyaupane, Parashu R; Barton, Ann; Diaz, Marlon
Subject(s):Spectroscopy as an analytical tool
Abstract:_x000d_ _x000d_ The thermal lens technique is applied to vibrational overtone spectroscopy of solutions of naphthalene in n-hexane. The pump and probe thermal lens technique is found to be very sensitive for detecting samples of low composition (ppm) in transparent solvents. In this experiment two different probe lasers: one at 488 nm and another 568 nm were used. The C-H fifth vibrational overtone spectrum of benzene is detected at room temperature for different concentrations. A plot of normalized integrated intensity as a function of concentration of naphthalene in solution reveals a non-linear behavior at low concentrations when using the 488 nm probe and a linear behavior over the entire range of concentrations when using the 568 nm probe. The non-linearity cannot be explained assuming solvent enhancement at low concentrations. A two color absorption model that includes the simultaneous absorption of the pump and probe lasers could explain the enhanced magnitude and the non-linear behavior of the thermal lens signal. Other possible mechanisms will also be discussed. _x000d_ _x000d_
Issue Date:6/21/2017
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/96910
DOI:10.15278/isms.2017.WE05
Date Available in IDEALS:2017-07-27


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