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Schultz, Thomas
CRASY(Correlated Rotational Alignment Spectroscopy)
Research Interests
  • Correlated spectroscopy

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Direct observation of electronic relaxation dynamics in adenine via time-resolved photoelectron spectroscopy

Cited 113 times inthomson ciCited 117 times inthomson ci
Title
Direct observation of electronic relaxation dynamics in adenine via time-resolved photoelectron spectroscopy
Author
Ullrich, S.Schultz, ThomasZgierski, M.Z.Stolow, A.
Keywords
ULTRAFAST INTERNAL-CONVERSION; JET-COOLED ADENINE; EXCITED-STATE; DNA; NUCLEOSIDES; MECHANISM; BASES; RNA
Issue Date
200403
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.126, no.8, pp.2262 - 2263
Abstract
We present femtosecond time-resolved photoelectron spectra of adenine in a molecular beam, recorded at pump wavelengths of 250, 267, and 277 nm. This leads to initial excitation of the bright S2(ππ*). Close to the band origin (277 nm), the lifetime is several picoseconds. Higher vibronic levels (267 and 250 nm excitation) show much shorter lifetimes of t < 50 fs, and we observe strong coupling between S2(ππ*) and S1(nπ*). Rapid internal conversion (t < 50 fs) populates the lower lying S1(nπ*) state which has a lifetime of 750 fs. At 267 nm, we found evidence for an additional channel which is consistent with the dissociative S3(πσ*) state, previously proposed as an ultrafast relaxation pathway from S2(ππ*).
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DOI
http://dx.doi.org/10.1021/ja030532q
ISSN
0002-7863
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