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Issue 26, 2019
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Automatic and semi-automatic assignment and fitting of spectra with PGOPHER

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Abstract

Two new tools for computer assisted assignment of rotational spectra with the PGOPHER program are presented, aimed particularly at spectra where many individual lines are resolved. The first tool tries many different assignments, presenting a small number for possible refinement and a preliminary version of this has already been presented. The second tool, the nearest lines plot (a new style of residual plot) provides a clear indication as to whether a trial calculation is plausible, and allows rapid assignment of sets of related lines. It gives good results even for dense spectra with no obvious structure and in the presence of multiple interfering absorptions. The effectiveness of these tools is demonstrated by the analysis of high resolution IR spectra of 8 bands of cis- and trans-1,2-dichloroethene where, including hot bands and isotopologues, 31 vibrational transitions and 158 316 individual lines have been analysed, including perturbations for the higher energy states. Walkthroughs are presented to show this process is rapid.

Graphical abstract: Automatic and semi-automatic assignment and fitting of spectra with PGOPHER

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Article information


Submitted
18 Oct 2018
Accepted
03 Dec 2018
First published
03 Dec 2018

Phys. Chem. Chem. Phys., 2019,21, 13986-13999
Article type
Paper

Automatic and semi-automatic assignment and fitting of spectra with PGOPHER

C. M. Western and B. E. Billinghurst, Phys. Chem. Chem. Phys., 2019, 21, 13986
DOI: 10.1039/C8CP06493H

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