Gas-phase Lifetimes of Nucleobase Analogues by Picosecond Pumpionization and Streak Techniques

Blaser, Susan; Frey, Hans-Martin; Heid, Cornelia G.; Leutwyler, Samuel (2014). Gas-phase Lifetimes of Nucleobase Analogues by Picosecond Pumpionization and Streak Techniques. CHIMIA, 68(4), pp. 260-263. Bern: Schweizerische Chemische Gesellschaft 10.2533/chimia.2014.260

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The picosecond (ps) timescale is relevant for the investigation of many molecular dynamical processes such as fluorescence, nonradiative relaxation, intramolecular vibrational relaxation, molecular rotation and intermolecular energy transfer, to name a few. While investigations of ultrafast (femtosecond) processes of biological molecules, e.g. nucleobases and their analogues in the gas phase are available, there are few investigations on the ps time scale. We have constructed a ps pump-ionization setup and a ps streak camera fluorescence apparatus for the determination of lifetimes of supersonic jet-cooled and isolated molecules and clusters. The ps pump-ionization setup was used to determine the lifetimes of the nucleobase analogue 2-aminopurine (2AP) and of two 2AP˙(H2O)n water cluster isomers with n=1 and 2. Their lifetimes lie between 150 ps and 3 ns and are strongly cluster-size dependent. The ps streak camera setup was used to determine accurate fluorescence lifetimes of the uracil analogue 2-pyridone (2PY), its self-dimer (2PY)2, two isomers of its trimer (2PY)3 and its tetramer (2PY)4, which lie in the 7–12 ns range.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Blaser, Susan; Frey, Hans-Martin and Leutwyler, Samuel

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science

ISSN:

0009-4293

Publisher:

Schweizerische Chemische Gesellschaft

Language:

English

Submitter:

Beatrice Niederhauser

Date Deposited:

25 Mar 2015 16:59

Last Modified:

13 Jul 2015 07:44

Publisher DOI:

10.2533/chimia.2014.260

BORIS DOI:

10.7892/boris.65840

URI:

https://boris.unibe.ch/id/eprint/65840

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