Analysis of the Terahertz Absorption Spectrum of Melamine

Yeun Hee Hwang, Yo Han Noh, Dongkyun Seo, Hak Min Yeo, Seongheun Kim, Jaehun Park, Hyang Sook Chun, Kyungwon Kwak

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this paper, with terahertz (THz) time-domain spectroscopy, we measure the characteristic absorption peaks of melamine and analyze their vibrational modes with the help of solid-state density functional theory (DFT) calculations. The observed strong absorption peaks at 2, 2.27, and 2.61 THz are well reproduced but show red shifts compared to the theoretical results. Detailed normal mode analyses are carried out, which reveals that those THz peaks are generated from intermolecular vibrations. Temperature-dependent THz measurements suggest that this red shift mainly comes from the temperature effect. Thus, three peaks are assigned to the calculated intermolecular vibrational motions. This result indicates that THz spectroscopy can be a useful tool to detect the details of intermolecular structures.

Original languageEnglish
Pages (from-to)891-895
Number of pages5
JournalBulletin of the Korean Chemical Society
Issue number3
Publication statusPublished - 2015 Mar 1
Externally publishedYes


  • Melamine
  • Solid-state density functional theory calculation
  • Terahertz spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)


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