Decoding Pure Rotational Molecular Spectra for Asymmetric Molecules

TL;DR

This paper presents an educational approach to understanding asymmetric molecular rotational spectra through pattern recognition, providing visual tools and simple formulas to facilitate spectral analysis in classroom settings.

Contribution

It introduces a method for teaching asymmetric rotational spectra using visual patterns and accessible formulas, supported by online resources for educational purposes.

Findings

Spectral patterns can be used for educational interpretation.

Pattern recognition aids in spectral assignment.

Online tools support teaching of molecular spectra.

Abstract

In this paper we demonstrate how asymmetric molecular rotational spectra may be introduced to students both "pictorially" and with simple formulae. It is shown that the interpretation of such spectra relies heavily upon pattern recognition. The presentation of some common spectral patterns in near-prolate asymmetric rotational spectra provides a means by which spectral assignment, and approximate rotational constant determination, may be usefully explored in the physics and chemistry classrooms. To aid in this endeavor we have created a supporting, free, web page and mobile web page.