| 1. |
- Hedén, Martin, 1976, et al.
(författare)
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Determination of the triplet state lifetime of vibrationally excited C-60
- 2003
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 118:16, s. 7161-7164
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Tidskriftsartikel (refereegranskat)abstract
- The lifetime of the ground triplet state of vibrationally excited C-60 has been determined in a two-color pump-probe experiment. An intense pump pulse (337 nm, 4 ns) was used to excite the neutral molecules. The triplet state was probed via single photon ionization with a weak probe pulse (193 nm). The lifetime was found to be on the order of 1 mus. This is rather low to explain recent delayed ionization results but higher than expected from an extrapolation of earlier measurements at lower temperatures. (C) 2003 American Institute of Physics.
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| 2. |
- Lassesson, Andreas, 1976, et al.
(författare)
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Formation of small lanthanum-carbide ions from laser induced fragmentation of La@C-82
- 2003
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 119:11, s. 5591-5600
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Tidskriftsartikel (refereegranskat)abstract
- The fragmentation behavior of the endohedral metallofullerene La@C-82 was studied using gas phase time-of-flight mass spectrometry. The results were compared with the fragmentation of C-60. When the metallofullerene was excited by a 337 nm ns laser, small lanthanum-carbide fragments LaCn+, n=0-6, were detected. A simple statistical maximum entropy model was used to simulate the excitation energy dependence of the loss of the LaCn+ molecules as well as C-2 evaporation to form smaller metallofullerenes. By comparing experimental ion intensities with the model, the appearance energies of LaCn+, n=0-6, were found to lie above 65 eV. The lanthanum-carbide fragments ejected from La@C-82 decrease in size with increasing internal energy. The ejection of La+ and LaC2+ is preferred at the expense of larger fragments such as LaC4+ and metallofullerenes at the higher excitation. (C) 2003 American Institute of Physics.
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| 3. |
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| 4. |
- Popok, Vladimir, 1966, et al.
(författare)
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Nanohillock formation by impact of small low-energy clusters with surfaces
- 2003
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Ingår i: Nuclear Instruments and Methods in Physics Research B. ; 207:2, s. 145-153
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Tidskriftsartikel (refereegranskat)abstract
- Results on nanoscale structuring of different substrates (silicon, pyrolytic graphite, indium-tin-oxide) using clusters from 20 to 100 atoms in size formed from gaseous precursors (O2, N2, Ar) at relatively low impact energy up to 15 keV are presented. Images of the substrate surfaces after cluster collisions obtained using atomic force microscopy (AFM) show the formation of hillocks from a few to 15 nm height with a basal diameter from 50 to 300 nm depending on implantation conditions. The shape and size of the structures are found to be a function of the cluster size and species, implantation energy, impact angle and the type of substrate. A model explaining the hillock formation is discussed.
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| 5. |
- Rychwalski, Rodney, 1945, et al.
(författare)
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CF, CB and SWNT Polymer Composites
- 2003
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Ingår i: The National Conferences on Polymer Characterization, X Seminar TWORZYWA SZTUCZNE W BUDOWIE MASZYN (Plastics in Machine Design), Cracow University of Technology, Cracow (Poland), September 29-October 1, 2003. ; , s. 347-357
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Konferensbidrag (refereegranskat)
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