Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 125, Issue 29, Pages 6498-6504Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.1c04558
Keywords
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Funding
- National Institutes of Health [R35GM133359]
- Welch Foundation [F-1891]
- UT Austin Provost Excellence Fellowship
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Researchers introduced a new method called the pump slice amplitude (PSA) method for comparing 2D IR and FTIR line shapes, and found that PSAs are more similar to FTIR line shapes in systems with low anharmonicity.
Ultrafast two-dimensional infrared (2D IR) spectroscopy and Fourier transform infrared (FTIR) spectroscopy are often performed in tandem, with FTIR typically used to interpret and provide hypotheses for 2D IR experiments. Comparisons between 2D IR and FTIR spectra can also be used to examine the structure and orientation in systems of coupled vibrational chromophores. The most common method for comparing 2D IR and FTIR lineshapes, the diagonal slice method, contains significant artifacts when applied to oscillators with low anharmonicities. Here, we introduce a new technique, the pump slice amplitude (PSA) method, for relating 2D IR lineshapes to FTIR lineshapes and compare PSAs against diagonal slices using theoretical and experimental spectra. We find that PSAs are significantly more similar to FTIR lineshapes than diagonal slices in systems with low anharmonicity.
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