We use ultrafast electron crystallography to study structural changes induced in graphite by a femtosecond laser pulse. At moderate fluences of < or =21 mJ/cm2, lattice vibrations are observed to thermalize on a time scale of approximately 8 ps. At higher fluences approaching the damage threshold, lattice vibration amplitudes saturate. Following a marked initial contraction, graphite is driven nonthermally into a transient state with sp3-like character, forming interlayer bonds. Using ab initio density functional calculations, we trace the governing mechanism back to electronic structure changes following the photoexcitation.
Direct observation of optically induced transient structures in graphite using ultrafast electron crystallography.
R. Raman,Y. Murooka,Chong-Yu Ruan,Teng-Jiao Yang,S. Berber,D. Tománek
Published 2008 in Physical Review Letters
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- Publication year
2008
- Venue
Physical Review Letters
- Publication date
2008-07-09
- Fields of study
Medicine, Materials Science, Physics
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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