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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2014

Development of Ultraviolet-Ultraviolet Hole-Burning Spectroscopy for Cold Gas-Phase Ions

Résumé

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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Dates et versions

hal-01009690 , version 1 (08-12-2017)

Identifiants

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Géraldine Féraud, Claude Dedonder, Christophe Jouvet, Yoshiya Inokuchi, Takeharu Haino, et al.. Development of Ultraviolet-Ultraviolet Hole-Burning Spectroscopy for Cold Gas-Phase Ions. Journal of Physical Chemistry Letters, 2014, 5 (7), pp.1236-1240. ⟨10.1021/jz500478w⟩. ⟨hal-01009690⟩

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