Variational calculations of dispersion coefficients for interactions among H, He, and Li atoms

Abstract

The dispersion coefficients C 6 , C 8 , and C 10 for the interactions between H, He, and Li are calculated using variational wave functions in Hylleraas basis sets with multiple exponential scale factors. With these highly correlated wave functions, significant improvements are made upon previous calculations and our results provide definitive values for these coefficients.

Energetics and structural properties of three-dimensional bosonic clusters near threshold

“…3 /E 2 withB 3 = −558(35) andC 3 = 565 (29), while a dotted line shows that derived in Ref. [8] for 1.54 ≤ E (1) 3 /E 2 ≤ 2 withB 3 = −742.0 andC 3 = 645.1.…”

“…Our calculations are performed for a realistic Van der Waals triplet tritium-tritium potential [24,25,26,27,28,29], which is repulsive at short interparticle distances r and falls off at large r as n=6,8,··· −C n r −n . Figure 1 shows the tritium-tritium potential as a function of the interparticle distance r. The potential has a minimum of depth −4.6cm −1 at r ≈ 7.8a 0 , where a 0 denotes the Bohr radius.…”

Formation of fermionic molecules via interisotope Feshbach resonances

“…[11,12], ␣ is directly related to the ionization energy ␣ 2 /2 [13], and C 8 and C 10 are taken from Ref. [14]. For smaller r we use the model singlet and triplet potentials, which have also been used in Refs.…”

Theoretical study of pressure broadening of lithium resonance lines by helium atoms

“…At large R, the potential energies vary as −C 6 /R 6 . The theoretical values of C 6 of 22.51 for the X 2 Σ state [21], 28.27 for the A 2 Π state [22] and 50.69 for the B 2 Σ state [22] were adopted. For each potential energy curve, the data in different segments were smoothly connected with a cubic spline procedure.…”