Linear and non-linear thermal lens signal of the fifth C-H vibrational overtone of naphthalene in liquid solutions of hexane

Manzanares, Carlos

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https://hdl.handle.net/2142/96910 Copy

Description

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

Issue Date

2017-06-21

Keyword(s)

Spectroscopy as an analytical tool

Date of Ingest

• 2017-07-27T20:15:14Z
• 2018-01-29T23:03:29Z

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_

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Genre of Resource

Conference Paper / Presentation

Language

eng

Permalink

http://hdl.handle.net/2142/96910

DOI

https://doi.org/10.15278/isms.2017.WE05

Copyright and License Information

Copyright 2017 Carlos Manzanares

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