Comprehensive characterization of the photodissociation pathways of protonated tryptophan.
The photofragmentation of protonated tryptophan has been investigated in a unique experimental setup, in which ion and neutral issued from the photofragmentation are detected in coincidence, in time and in position. From these data are extracted the kinetic energy, the number of neutral fragments associated with an ion, their masses, and the order of the fragmentation steps. Moreover, the fragmentation time scale ranging from tens of nanoseconds to milliseconds is obtained. From all these data, a comprehensive fragmentation mechanism is proposed.
Lepère
V
V
Laboratoire des Collisions Atomiques et Moléculaires (CNRS UMR C8625), Batiment 351, Université Paris Sud, 91405 Orsay cedex, France.
Lucas
B
B
Barat
M
M
Fayeton
J A
JA
Picard
V J
VJ
Jouvet
C
C
Carçabal
P
P
Nielsen
I
I
Dedonder-Lardeux
C
C
Grégoire
G
G
Fujii
A
A
D003198:Computer Simulation; D008027:Light; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation / Q000528:radiation effects; D010777:Photochemistry / Q000379:methods*; D011522:Protons; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014364:Tryptophan / Q000737:chemistry* / Q000528:radiation effects*
D011522:Protons; D014364:Tryptophan