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| 2. |
- Lassesson, Andreas, 1976, et al.
(author)
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A femtosecond laser study of the endoral fullerenes Li@C60 and La@C82
- 2005
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In: Eur. Phys. J. D. - : Springer Science and Business Media LLC. - 1434-6060. ; 34, s. 205-209
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Journal article (peer-reviewed)abstract
- The endohedral fullerenes La@C82 and Li@C60 have been studied in the gas phase with femtosecond laser excitation. The two molecules show qualitatively the same behaviour with respect to ion yield vs. pulse energy, but markedly different fragmentation patterns, with La@C82 fragmenting via the shrink-wrap mechanism and Li@C60 predominantly losing the metal atom in the first fragmentation step. The ion yields and electron energy distributions of La@C82 agree well with a recently developed model for fs laser ionisation of C60.
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| 3. |
- Lassesson, Andreas, 1976, et al.
(author)
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Formation of small lanthanum-carbide ions from laser induced fragmentation of La@C-82
- 2003
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In: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 119:11, s. 5591-5600
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Journal article (peer-reviewed)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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| 4. |
- Lassesson, Andreas, 1976, et al.
(author)
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Investigations into the fragmentation and ionization of highly excited La@C-82
- 2002
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In: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 117:21, s. 9811-9817
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Journal article (peer-reviewed)abstract
- We report the first measurements of delayed ionization of the metallofullerene La@C-82. When highly excited in laser desorption, La@C-82 was found to ionize over several microseconds. The rate of delayed ionization of La@C-82 was compared to C-60 under the same extraction conditions, and found to be significantly different. A theoretical model was used for the fitting of the ion signal of the two fullerenes. The metallofullerene results can be fitted well over a time window
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| 5. |
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| 6. |
- Schnadt, Joachim, et al.
(author)
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Electron-spectroscopy study of LiC60: Charge transfer and dimer formation
- 2000
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In: Physical Review B (Condensed Matter). - 0163-1829. ; 62, s. 4253-4253
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Journal article (peer-reviewed)abstract
- Li−C60 compounds Lix¯C60 were studied for average Li concentration x¯<~1 using photoelectron spectroscopy. Strong evidence is found for the formation of LiC60 dimers, as well as a second phase. The study suggests that the smallest alkali-metal Li bonds to C60 largely ionically for certain configurations. An investigation of the Li 1s level shows that under certain conditions the energetics favor a backdonation of the transferred electron to the Li ion.
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| 7. |
- Schnadt, J, et al.
(author)
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Electron-spectroscopy study of LiC60: Charge transfer and dimer formation
- 2000
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In: PHYSICAL REVIEW B. - : AMERICAN PHYSICAL SOC. - 0163-1829. ; 62:7, s. 4253-4256
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Journal article (peer-reviewed)abstract
- Li-C-60 compounds LixC60 were studied for average Li concentration (x) over bar less than or equal to 1 using photoelectron spectroscopy. Strong evidence is found for the formation of LiC60 dimers, as well as a second phase. The study suggests that the sm
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