Variational calculation of muonium hydride

Abstract

The ground-state energies of muonium hydride and its isotopes are calculated using a variational method in Hylleraas coordinates. Convergence to a few parts in 109 is achieved, which significantly improves the previous results of Suffczyński, Kotowski and Wolniewicz (2002 Acta Phys. Pol. A 102 351). Expectation values of the interparticle distances are evaluated.

Crossed‐Beam and Quantum Dynamics Studies of the Reaction Cl + CHD3

“…The experiments were carried out using the crossed-beam apparatus described in detail previously. 45,48,50 In brief, a highvoltage discharge source was used to generate a pulsed Clatom beam (3.5% Cl 2 seeded in helium at 6 atm). A diluted CHD 3 beam (~50% of CHD 3 in He) was delivered from a second pulsed valve at 6 atm.…”

“…The reaction products, CD 3 and CHD 2 , were probed by (2+1) resonance-enhanced multiphoton ionization (REMPI), 50 using the time-sliced ion velocity imaging technique. 45,48 To account for the variation of the rotational excitation of methyl products, the laser frequency of the probe was scanned back and forth over the peak of the X 2 A 2 → 3p A z 2 2 0 0 0 Q-head while the image was acquired. Depending on the signal strength, each time-sliced image was taken at 20 Hz for 1-2 h, accumulating 5 × 10 4 to 1.5 × 10 5 total events.…”

“…The dynamics of the ground-state reaction, which must be assessed in order to gain deeper insights into the vibrational-excited reaction dynamics, has also been under experimental scrutiny recently. [44][45][46][47] Exploiting a time-sliced velocity imaging technique, 48 we reported an extensive study on Cl + CH 4 (v = 0) and CD 4 (v = 0) over a wide range of collision energies under crossed-beam conditions. 45,46 A pronounced isotope effect was discovered in product angular distributions of the two reactions.…”

“…[44][45][46][47] Exploiting a time-sliced velocity imaging technique, 48 we reported an extensive study on Cl + CH 4 (v = 0) and CD 4 (v = 0) over a wide range of collision energies under crossed-beam conditions. 45,46 A pronounced isotope effect was discovered in product angular distributions of the two reactions. 45 Both distributions are mainly backward-scattered near reaction thresholds and shift progressively toward sideways with a cutoff in angles against the formation of forward-scattered products as the collision energy increases.…”

“…3 Therefore, a qualitative interpretation that both quantum effects-the zero-point energy and the tunneling-are at work was proposed for the striking difference in angular distributions of the two isotopic reactions. 45 Reported here is a joint experimental and theoretical study on an isotopically analogous reaction Cl + CHD 3 → HCl + CD 3 , and DCl + CHD 2 . The results on the Hatom and D-atom abstraction channels will then be compared to the Cl + CH 4 and CD 4 reactions to gain deeper insights.…”