Stable Compounds of Helium and Neon: He@C60 and Ne@C60

  title={Stable Compounds of Helium and Neon: He@C60 and Ne@C60},
  author={Martin. Saunders and Hugo A. Jim�nez-V�zquez and R. James Cross and Robert J. Poreda},
  pages={1428 - 1430}
It is demonstrated that fullerenes, prepared via the standard method (an arc between graphite electrodes in a partial pressure of helium), on heating to high temperatures release 4He and 3He. The amount corresponds to one 4He for every 880,000 fullerene molecules. The 3He/4He isotopic ratio is that of tank helium rather than that of atmospheric helium. These results convincingly show that the helium is inside and that there is no exchange with the atmosphere. The amount found corresponds with a… 

Terahertz spectroscopy of the helium endofullerene He@C60.

We studied the quantized translational motion of single He atoms encapsulated in molecular cages by terahertz absorption. The temperature dependence of the THz absorption spectra of 3He@C60 and

Helium Chemistry: A Survey of the Role of the Ionic Species

Abstract The ion chemistry of helium currently embraces a large variety of species, mostly cationic, which range from simple small-size molecular fragments or complexes to large-size cluster ions and

Noble Gas Atoms Inside Fullerenes

Heating fullerenes at 650°C under 3000 atmospheres of the noble gases helium, neon, argon, krypton, and xenon introduces these atoms into the fullerene cages in about one in 1000 molecules. A

Fullerenes: an extraterrestrial carbon carrier phase for noble gases.

It is determined that both the Allende and Murchison fullerene cage structure and the KTB fullerenes contain trapped noble gases with ratios that can only be described as extraterrestrial in origin.

Radical Impurity Mechanisms for Helium Incorporation into Buckminsterfullerene

Radical impurity mechanisms for incorporating He into C60 have been examined by semiempirical (MNDO) and density functional (BLYP/3-21G) calculations. The key step in these mechanisms is the

Equilibrium yield for helium incorporation into buckminsterfullerene: Quantum-chemical evaluation

The binding energy and equilibrium constant for the endohedral He@C60 compound have been determined from ab initio and density functional (DFT) calculations. Very large grids for the numerical

High stability of the He atom confined in a U@C60 fullerene

To understand the confined nature of rare gases in endohedral metallofullerenes (EMFs) encapsulating actinide metals, here we study the interaction between a He atom and uranium metallofullerene

Neutral helium compounds: theoretical evidence for a large class of polynuclear complexes.

The results suggest the conceivable existence of an, in principle, very large class of M(NBeHe)(n) (n>1) polyhelium complexes, whose stability may be substantially affected by the nature and the size of the central moiety M.



Electron paramagnetic resonance studies of lanthanum-containing C82

THE conjecture that atoms can be trapped inside closed carbon cages such as the fullerenes was first made by Kroto et al1. Mass spectroscopic evidence obtained soon after2 suggested that lanthanum

Scandium Clusters in Fullerene Cages

Production of macroscopic quantities of clustercontaining fullerenes may make possible the fabrication of exotic new structures with regular arrays of metal-atom clusters isolated in fullerene molecules, resulting in a new type of host/guest nanostructured material.

Endohedral fullerene-noble gas clusters formed with high-energy bimolecular reactions of Cxn+ (x=60, 70; n=1,2,3)

Results are reported for high-energy beam experiments which establish the formation of endohedral carbon cluster-noble gas compounds by bimolecular reactions of C (x = 60, 70; n = 1, 2, 3) with He

Lanthanum complexes of spheroidal carbon shells

Laser vaporization of graphite in a high-pressure supersonic nozzle produced a remarkable stable C60 molecule in high yield with striking and exciting new properties. Specifically it was found that

Carbon clusters revisited: The ‘‘special’’ behavior of C60 and large carbon clusters

We have performed a series of experiments in which the conditions necessary for synthesis and detection of carbon clusters have been systematically investigated. The effects of ionizing laser

On the application of the minimal principle to solve unknown structures.

This report focuses on algorithmic and parametric optimizations of Shake-and-Bake and the determination of two previously unknown structures that contain 105 and 110 non-hydrogen atoms, respectively.