Infrared Spectroscopy Of Alanine In Solid Parahydrogen

Toh, Shin Yi

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https://hdl.handle.net/2142/51151 Copy

Description

Title

Infrared Spectroscopy Of Alanine In Solid Parahydrogen

Author(s)

Toh, Shin Yi

Contributor(s)

• Momose, Takamasa
• Djuricanin, Pavle
• Wong, Ying-Tung Angel

Issue Date

2014-06-19

Keyword(s)

Matrix isolation (and droplets)

Abstract

Amino acids are the building blocks of biological molecules, and thus the investigation of their physical and chemical properties would allow for further understanding of their functions in biological systems. In addition, the existence of amino acids in interstellar space has been discussed for many years, but it is still under intense debate. The effect of UV radiation on amino acids is one of the keys for their search in interstellar space, where strong UV radiation exists. In this experiment, conformational compositions of alpha and beta alanine and their UV photolysis were investigated via matrix-isolation FTIR spectroscopy and quantum chemical calculations. Solid parahydrogen was used as the matrix, which provides higher resolution spectra than other noble gas matrices. We have identified several stable conformers for both alpha and beta alanine in solid parahydrogen. A clear correlation between conformational ratio and sublimation temperature was found for beta alanine. Furthermore, it was found that UV photolysis of alanine yields not only its conformational changes, but also photodissociation into a CO$_{2}$ molecule and fragments. Observed spectra and their analysis will be discussed in relation to interstellar chemistry.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51151

DOI

https://doi.org/10.15278/isms.2014.RI10

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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