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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
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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