Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 120, Issue 14, Pages 2179-2184Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.6b01194
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Funding
- JSPS [25002918]
- Investissements d'Avenir LABEX PALM [ANR-10-LABX-0039-PALM]
- Grants-in-Aid for Scientific Research [25410023, 16K05662] Funding Source: KAKEN
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The ultrafast deactivation processes in the excited state of biomolecules, such as the most stable tautomers of guanine, forbid any state-of-the-art gas phase spectroscopic studies on these species with nanosecond lasers. This drawback can be overcome by grafting a chromophore having a long-lived excited state to the molecule of interest, allowing thus a mass-selective detection by nanosecond R2PI and therefore double resonance IR/UV conformer-selective spectroscopic studies. The principle is presently demonstrated on the keto form of a modified 9-methylguanine, for which the IR/UV double resonance spectrum in the C=O stretch region, reported for the first time, provides evidence for extensive vibrational couplings within the guanine moiety. Such a successful strategy opens up a route to mass-selective IR/UV spectroscopic investigations on molecules exhibiting natural chromophores having ultrashort-lived excited states, such as DNA bases, their complexes as well as peptides containing short-lived aromatic residues.
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