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

被引：43

作者：

Feraud, Geraldine ^{[1
]}

Dedonder, Claude ^{[1
]}

Jouvet, Christophe ^{[1
]}

Inokuchi, Yoshiya ^{[2
]}

Haino, Takeharu ^{[2
]}

Sekiya, Ryo ^{[2
]}

Ebata, Takayuki ^{[2
]}

机构：

[1] Aix Marseille Univ, CNRS, PIIM UMR 7345, F-13397 Marseille, France

[2] Hiroshima Univ, Grad Sch Sci, Dept Chem, Higashihiroshima 7398526, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2014年 / 5卷 / 07期

关键词：

ALKALI-METAL CATIONS; CROWN-ETHERS; COMPLEXES; TRAP; SPECTRA; PEPTIDE; UV; PHOTODISSOCIATION; TEMPERATURE; CHROMOPHORE;

D O I：

10.1021/jz500478w

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：1236 / 1240

页数：5

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