期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 7, 页码 1236-1240出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz500478w
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资金
- France Japan Collaboration Program (SAKURA), France
- Japan Society for Promotion of Science
- ANR [ESPEM- ANR2010BLANC040501]
- Grants-in-Aid for Scientific Research [25102532, 24655064, 25109529, 25410017] Funding Source: KAKEN
A new ultraviolet-ultraviolet hole-burning (UV-UV HB) spectroscopic scheme has been developed for cold gas-phase ions in a quadrupole ion trap (QIT) connected with a time-of-flight (TOF) mass spectrometer. In this method, a pump UV laser generates a population hole for the ions trapped in the cold QIT, and a second UV laser (probe) monitors the population hole for the ions extracted to the field-free region of the TOF mass spectrometer. Here, the neutral fragments generated by the UV dissociation of the ions with the second laser are detected. This UV-UV HB spectroscopy was applied to protonated dibenzylamine and to protonated uracil. Protonated uracil exhibits two strong electronic transitions; one has a band origin at 31760 cm(-1) and the other at 39000 cm(-1). From the UV-UV HB measurement and quantum chemical calculations, the lower-energy transition is assigned to the enol-keto tautomer and the higher-energy one to the enol-enol tautomer.
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