Direct double ionization of C60 and C70 fullerenes using synchrotron radiation

Steger, H.; Vries, J. de; Kamke, B.; Kamke, W.; Drewello, Thomas

doi:10.1016/0009-2614(92)86081-r

Cited by 116 publications

(63 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…66 Reaction (R5c) is less endothermic than the charge separation reaction (R5b) by 4.0 eV. As a result one expects that the two positive holes in the complex [H 2 C 60 ] 2+ are localized on the fullerene, H 2 is physisorbed at C 60 2+ , and H 2 C 60 2+ is stable with respect to charge separation.…”

Section: B Doubly Charged Ionsmentioning

confidence: 97%

Adsorption of hydrogen on neutral and charged fullerene: Experiment and theory

Kaiser

Leidlmair

Bartl

et al. 2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

A consistent and accurate ab initio parametrization of density functional dispersion correction (DFT-D) for the 94 elements H-Pu The Journal of Chemical Physics 132, 154104 (2010) Helium droplets are doped with fullerenes (either C 60 or C 70 ) and hydrogen (H 2 or D 2 ) and investigated by high-resolution mass spectrometry. In addition to pure helium and hydrogen cluster ions, hydrogen-fullerene complexes are observed upon electron ionization. The composition of the main ion series is (H 2 ) n HC m + where m = 60 or 70. Another series of even-numbered ions, (H 2 ) n C m + , is slightly weaker in stark contrast to pure hydrogen cluster ions for which the even-numbered series (H 2 ) n + is barely detectable. The ion series (H 2 ) n HC m + and (H 2 ) n C m + exhibit abrupt drops in ion abundance at n = 32 for C 60 and 37 for C 70 , indicating formation of an energetically favorable commensurate phase, with each face of the fullerene ion being covered by one adsorbate molecule. However, the first solvation layer is not complete until a total of 49 H 2 are adsorbed on C 60 + ; the corresponding value for C 70 + is 51. Surprisingly, these values do not exhibit a hydrogen-deuterium isotope effect even though the isotope effect for H 2 /D 2 adsorbates on graphite exceeds 6%. We also observe doubly charged fullerene-deuterium clusters; they, too, exhibit abrupt drops in ion abundance at n = 32 and 37 for C 60 and C 70 , respectively. The findings imply that the charge is localized on the fullerene, stabilizing the system against charge separation. Density functional calculations for C 60 -hydrogen complexes with up to five hydrogen atoms provide insight into the experimental findings and the structure of the ions. The binding energy of physisorbed H 2 is 57 meV for H 2 C 60 + and (H 2 ) 2 C 60 + , and slightly above 70 meV for H 2 HC 60 + and (H 2 ) 2 HC 60 + . The lone hydrogen in the odd-numbered complexes is covalently bound atop a carbon atom but a large barrier of 1.69 eV impedes chemisorption of the H 2 molecules. Calculations for neutral and doubly charged complexes are presented as well.

show abstract

Section: B Doubly Charged Ionsmentioning

confidence: 97%

Adsorption of hydrogen on neutral and charged fullerene: Experiment and theory

Kaiser

Leidlmair

Bartl

et al. 2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…A later theoretical e †ort (Faraci, Pennisi, & Margaritondo 1989) was able to reproduce the results, but only by assuming that the condition for an electron to escape, when incident on the surface from within, depends only on its energy and not on its direction of motion. The estimates adopted here for size-dependent yields from grains are based on WatsonÏs (1973) Lichtenberger et al (1991), Lichtenberger, Rempe, & Gogosha (1992), and Steger et al (1992) for fullerenes and C 60 C 70 . interstellar dust will not be possible until experiments have been performed on submicron grains of appropriate composition.…”

Section: Photoelectric Y Ieldsmentioning

confidence: 99%

Photoelectric Emission from Interstellar Dust: Grain Charging and Gas Heating

Weingartner

Draine

2001

ASTROPHYS J SUPPL S

514

672

View full text Add to dashboard Cite

We model the photoelectric emission from and charging of interstellar dust and obtain photoelectric gas heating efficiencies as a function of grain size and the relevant ambient conditions. We employ improved estimates for photoelectric thresholds, yields, and electron capture rates. Using realistic grain size distributions, we evaluate the net gas heating rate for various interstellar environments and Ðnd less heating for dense regions characterized by than for di †use regions with We provide R V \ 5.5 R V \ 3.1. Ðtting functions that reproduce our numerical results for photoelectric heating and recombination cooling for a wide range of interstellar conditions. Finally, we investigate the potential importance of photoelectric heating in H II regions, including the warm ionized medium. We Ðnd that photoelectric heating could be comparable to or exceed heating due to photoionization of H for high ratios of the radiation intensity to the gas density. We also Ðnd that photoelectric heating by dust can account for the observed variation of temperature with distance from the Galactic midplane in the warm ionized medium.

show abstract

“…where A are electron affinities and I are ionization potentials with known experimental values (in eV) [12,13]: Using these data we obtain the estimates presented in Table for injected charges of both signs. It can be seen that injected charges, both electrons and holes, are located predominantly in the surface layer.…”

Section: Resultsmentioning

confidence: 99%

Distribution of field-induced charges in C60 fullerite

Kuprievich

Kapitanchuk

Shramko

et al. 2006

Low Temperature Physics

View full text Add to dashboard Cite

The profile of injected charges in a C 60 -based field-effect transistor (FET) is considered. A simple scheme for calculations of the charge distribution between the 2D layers of C 60 molecules is founded on a small magnitude of the interball electron hopping. Analytical solutions of the equations for the charge distributions are obtained in the limits of thick and thin crystals. The charge density is shown to drop exponentially with the crystal depth. The calculations predict the relative part of induced charges involved in the surface layer to be 3/4 and 2/3 in the cases of electron and hole injection, respectively. PACS: 71.10.-w, 31.25.Eb, 73.90.+f

show abstract

Direct double ionization of C60 and C70 fullerenes using synchrotron radiation

Cited by 116 publications

References 25 publications

Adsorption of hydrogen on neutral and charged fullerene: Experiment and theory

Adsorption of hydrogen on neutral and charged fullerene: Experiment and theory

Photoelectric Emission from Interstellar Dust: Grain Charging and Gas Heating

Distribution of field-induced charges in C60 fullerite

Contact Info

Product

Resources

About