期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 122, 期 28, 页码 5978-5982出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.8b04978
关键词
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资金
- national science foundation (NSF) [NSF CHE - CSDMA 1465085]
- BASF SE
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1465085] Funding Source: National Science Foundation
We present terahertz (THz) measurements and density functional theory (DFT) calculations of two amino acid crystals: DL-norleucine and DL-methionine. Their molecular structures are very similar and therefore also their crystal structures. We report the absorption spectra for both amino acids, which have a strong resonance at 1.87 THz in DL-norleucine and 1.94 THz in DL-methionine. In addition, we find a higher frequency resonance at 2.49 THz in DL-methionine, which has no corresponding mode in DL-norleucine. The experimental data are supported by DFT calculations, which show that the origin of the two strongest vibrational modes in DL-norleucine and DL-methionine are based on the same underlying vibrational motions, whereas the 2.49 THz resonance in DL-methionine is due to the motion of the sulfur atom, which is not present in DL-norleucine.
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