Excited-state relaxation of protonated adenine.
The excited state dynamics of protonated adenine in the gas phase were investigated by femtosecond pump-probe transient mass spectroscopy. Adenine was protonated in an electrospray ionization source and transferred to a Paul trap. Two femtosecond laser pulses at 266 nm and 800 nm excited the lowest electronic pipi* state and probed the excited-state dynamics by monitoring ion fragment formation. The measured excited state decay is monoexponential with a lifetime shorter than 161 fs. This agrees with a theoretical prediction of very fast internal conversion via a conical intersection with the ground state.
Nolting
Dirk
D
Max Born Institute, Max-Born-Strasse 2a, 12489 Berlin, Germany. nolting@mbi-berlin.de
Weinkauf
Rainer
R
Hertel
Ingolf V
IV
Schultz
Thomas
T
D000225:Adenine / Q000737:chemistry*; D005740:Gases / Q000737:chemistry; D007834:Lasers; D008027:Light; D008968:Molecular Conformation / Q000528:radiation effects; D010777:Photochemistry; D011522:Protons; D021241:Spectrometry, Mass, Electrospray Ionization
D005740:Gases; D011522:Protons; D000225:Adenine