Details
| Original language | English |
|---|---|
| Pages (from-to) | 3751-3754 |
| Number of pages | 4 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 3 |
| Issue number | 24 |
| Early online date | 5 Dec 2012 |
| Publication status | Published - 20 Dec 2012 |
| Externally published | Yes |
Abstract
We present the first direct measurement of ultrafast charge migration in a biomolecular building block - the amino acid phenylalanine. Using an extreme ultraviolet pulse of 1.5 fs duration to ionize molecules isolated in the gas phase, the location of the resulting hole was probed by a 6 fs visible/near-infrared pulse. By measuring the yield of a doubly charged ion as a function of the delay between the two pulses, the positive hole was observed to migrate to one end of the cation within 30 fs. This process is likely to originate from even faster coherent charge oscillations in the molecule being dephased by bond stretching which eventually localizes the final position of the charge. This demonstration offers a clear template for observing and controlling this phenomenon in the future.
Keywords
- Excited States, Photochemistry, Spectroscopy
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of Physical Chemistry Letters, Vol. 3, No. 24, 20.12.2012, p. 3751-3754.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Observation of ultrafast charge migration in an amino acid
AU - Belshaw, Louise
AU - Calegari, Francesca
AU - Duffy, Martin J.
AU - Trabattoni, Andrea
AU - Poletto, Luca
AU - Nisoli, Mauro
AU - Greenwood, Jason B.
PY - 2012/12/20
Y1 - 2012/12/20
N2 - We present the first direct measurement of ultrafast charge migration in a biomolecular building block - the amino acid phenylalanine. Using an extreme ultraviolet pulse of 1.5 fs duration to ionize molecules isolated in the gas phase, the location of the resulting hole was probed by a 6 fs visible/near-infrared pulse. By measuring the yield of a doubly charged ion as a function of the delay between the two pulses, the positive hole was observed to migrate to one end of the cation within 30 fs. This process is likely to originate from even faster coherent charge oscillations in the molecule being dephased by bond stretching which eventually localizes the final position of the charge. This demonstration offers a clear template for observing and controlling this phenomenon in the future.
AB - We present the first direct measurement of ultrafast charge migration in a biomolecular building block - the amino acid phenylalanine. Using an extreme ultraviolet pulse of 1.5 fs duration to ionize molecules isolated in the gas phase, the location of the resulting hole was probed by a 6 fs visible/near-infrared pulse. By measuring the yield of a doubly charged ion as a function of the delay between the two pulses, the positive hole was observed to migrate to one end of the cation within 30 fs. This process is likely to originate from even faster coherent charge oscillations in the molecule being dephased by bond stretching which eventually localizes the final position of the charge. This demonstration offers a clear template for observing and controlling this phenomenon in the future.
KW - Excited States
KW - Photochemistry
KW - Spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=84871593045&partnerID=8YFLogxK
U2 - 10.1021/jz3016028
DO - 10.1021/jz3016028
M3 - Article
AN - SCOPUS:84871593045
VL - 3
SP - 3751
EP - 3754
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 24
ER -