title: Control of bond-cleaving reactions of free protonated tryptophan ion by femtosecond laser pulses.
abstract: 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.
authors.forename: H
authors.initials: H
authors.lastname: Kang
authors.forename: C
authors.initials: C
authors.lastname: Dedonder-Lardeux
authors.forename: C
authors.initials: C
authors.lastname: Jouvet
authors.forename: G
authors.initials: G
authors.lastname: Grégoire
authors.forename: C
authors.initials: C
authors.lastname: Desfrançois
authors.forename: J-P
authors.initials: JP
authors.lastname: Schermann
authors.forename: M
authors.initials: M
authors.lastname: Barat
authors.forename: J A
authors.initials: JA
authors.lastname: Fayeton
mesh_terms: D002412:Cations / Q000737:chemistry*; D007834:Lasers; D013058:Mass Spectrometry; D011522:Protons; D014364:Tryptophan / Q000737:chemistry*
chemical_list: D002412:Cations; D011522:Protons; D014364:Tryptophan