On (He)

He on preplated graphite

By using the diffusion Monte Carlo method, we obtained the full phase diagram of He on top of graphite preplated with a solid layer of He. All the He atoms of the substrate were explicitly considered and allowed to move during the simulation. We found that the ground state is a liquid of density 0.007 ± 0.001 Å, in good agreement with available experimental data. This is significantly different...

Comment on “Apatite He/He and (U-Th)/He Evidence for an Ancient Grand Canyon”

Flowers and Farley (Reports, 21 December 2012, p. 1616; published online 29 November 2012) use thermochronometry to propose that the western paleo–Grand Canyon was nearly as deep 70 million years ago (Ma) as today. However, lithologies, facies relations, geomorphology, and paleotopography of Miocene interior-basin deposits near the mouth of the Grand Canyon show that no paleocanyon existed in t...

he is one and there is naught but he (isfahani hatif on the summit of tarjiband)

the celebrated poem of ahmad hatif of isfahn, known in persian as the hatef’s tarjiband is studied in the present paper from a historical point of view to reveal the status of this poet in persian poetry, as well as its mystical content. first a short history of tarjiband as a poetic form is revised, then the sixteen poets who have written a mystical tarjiband are presented. all of these tarj...

Calculations of the binding energies of weakly bound He–He–H, He–He–H− and He–H–H molecules

We searched for the existence of weakly bound He–He–H, He–He–H− and He–H– H molecules where the binding energies are expected to be of the order of degrees Kelvin. By employing the best empirical interaction between each pair of particles, we solved the Schrödinger equation for the triatomic systems using hyperspherical coordinates in the adiabatic approximation. We found no bound states for 4H...

Autoionization of He and Autodetachment of He- following Bombardment by H+, H2+, He+, and He Atoms