Direct observation of electronic relaxation dynamics in adenine via time-resolved photoelectron spectroscopy
Cited 113 times inCited 117 times in
- Direct observation of electronic relaxation dynamics in adenine via time-resolved photoelectron spectroscopy
- Ullrich, S.; Schultz, Thomas; Zgierski, M.Z.; Stolow, A.
- ULTRAFAST INTERNAL-CONVERSION; JET-COOLED ADENINE; EXCITED-STATE; DNA; NUCLEOSIDES; MECHANISM; BASES; RNA
- Issue Date
- AMER CHEMICAL SOC
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.126, no.8, pp.2262 - 2263
- 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*).
- ; Go to Link
Appears in Collections:
- SNS_Journal Papers
can give you direct access to the published full text of this article. (UNISTARs only)
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.