Control of Bond-Cleaving Reactions of Free Protonated Tryptophan Ion by Femtosecond Laser Pulses

Control of Bond-Cleaving Reactions of Free Protonated Tryptophan Ion by Femtosecond Laser Pulses

The excited-state dynamics of protonated tryptophan ions is investigated by photoinduced fragmentation in the gas phase. In contrast to the neutral molecule that decays on the nanosecond time scale, the protonated species exhibits an ultrafast decay with two time constants of about 400 fs and 15 ps....

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Veröffentlicht in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2005-03, Vol.109 (11), p.2417-2420
Hauptverfasser: Kang, H, Dedonder-Lardeux, C, Jouvet, C, Grégoire, G, Desfrançois, C, Schermann, J.-P, Barat, M, Fayeton, A
Format: Artikel
Sprache:eng
Schlagworte:
Biological Physics
Cations - chemistry
Chemical Physics
Lasers
Mass Spectrometry
Physics
Protons
Tryptophan - chemistry
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Beschreibung
Zusammenfassung:The excited-state dynamics of protonated tryptophan ions is investigated by photoinduced fragmentation in the gas phase. In contrast to the neutral molecule that decays on the nanosecond time scale, the protonated species exhibits an ultrafast decay with two time constants of about 400 fs and 15 ps. In addition, after UV excitation by a pump photon at 266 nm, specific photofragments, and in particular the NH3-loss channel, can be enhanced by the absorption of a probe photon at 800 nm. The bond-cleaving reactions can thus be controlled by a variation of the pump/probe delay.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp0407167