Honors Theses

Date of Award

Spring 5-1-2021

Document Type

Undergraduate Thesis

Department

Chemistry and Biochemistry

First Advisor

Ryan Fortenberry

Second Advisor

Nathan Hammer

Third Advisor

Steven Davis

Relational Format

Dissertation/Thesis

Abstract

Astrochemistry has been substantially aided by computational techniques, particularly through the use of Quartic Force Field (QFF) analysis. Several methods have proven useful at correlating computed spectroscopic data with experimental observations. The F12-TZ QFF correlated well with experimental data for silicon oxide compounds, particularly those potentially involved in development from rocky bodies to planetary masses [27]. Compared to argon matrix experimental data, the vibrational frequencies for the molecules SiO2, SiO3, Si2O3, and Si2O4 become less accurate as the complexity of the molecules increases but should still be predictive of infrared characteristics of silicon oxides as they form clusters in space [27]. The CcCR QFF was found to be accurate for predicting B0 and C0 rotational constants within 35 MHz and vibrational frequencies within 5.7 cm-1 for many molecules, including those with heavy atoms [21]. When used in conjunction, the F12-TZ and CcCR QFFs produced parallel data for predicting the brightest vibrational frequencies in relatively complex molecules containing noble gases; rotational constants produced by the CcCR QFFs also present evidence for future identification of such molecules.

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Creative Commons License

Creative Commons Attribution-NonCommercial 4.0 International License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License

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