Journal
CHEMICAL PHYSICS LETTERS
Volume 688, Issue -, Pages 26-32Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2017.09.049
Keywords
Methacetin (MA); Resonant two-photon ionization (R2PI); UV-UV hole-burning (UV-UV HB) spectroscopy; IR-dip spectroscopy; Quantum chemical calculations
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2016R1D1A1B03934376]
- Supercomputing Center/Korea Institute of Science and Technology Information (KISTI) [KSC-2017-C1-0002]
- Korea Government (MSIP) [2017M2B2A9A02049940, 2017R1A41014595]
- National Research Foundation of Korea [2016R1D1A1B03934376] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The excitation spectra of jet-cooled methacetin (MA) have been measured using a combination of massselected resonant two-photon ionization and ultraviolet-ultraviolet hole-burning (UV-UV HB) spectroscopy in the gas phase. Four different UV-UV HB spectra originating from two conformers of MA (syn-and anti-MA) with their fundamental and hot transitions have been obtained. IR-dip spectroscopy has conclusively confirmed the coexistence of the two conformers with the aid of theoretical calculations. Vibronic band assignments in the low frequency region caused by internal methyl group rotation in the methyl-capped peptide group, which originate from the 1e rotational level, are presented. (C) 2017 Elsevier B.V. All rights reserved.
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