Abstract
High-resolution absorption spectra of adenine, 9-methyladenine and 2-aminopurine in helium nanodroplets have been recorded. In contrast to molecular beam experiments, large variations in linewidths are observed for adenine and 9-methyladenine. At the same time, the spectrum of 2-aminopurine remains sharp upon solvation in helium droplets. The line broadening observed for adenine and 9-methyladenine is attributed to a significant decrease of the lifetime of the 1Lb(ππ*) state and of 1nπ* levels vibronically coupled to this state. The origin of the lifetime reduction is argued to be related to the increased accessibility of the 1nπ*/1Lb(ππ*) conical intersection upon solvation of these molecules in liquid helium.
Original language | English |
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Pages (from-to) | 15600-15606 |
Number of pages | 7 |
Journal | Physical Chemistry Chemical Physics |
Volume | 12 |
Issue number | 48 |
DOIs | |
Publication status | Published - 28 Dec 2010 |
Externally published | Yes |