Calculs des niveaux d'énergie liés et quasi-liés des ions moléculaires muoniques Heμ+ et Neμ+

Abstract

2014 A partir des courbes de potentiel des systèmes HeH+ et NeH+, on a calculé les niveaux d'énergie rovibrationnels des ions moléculaires mésiques correspondants (He03BC+ et Ne03BC+). On a aussi déterminé les énergies des états quasi-liés, la hauteur des barrières de potentiel correspondantes ainsi que les durées de vie de ces états vis-à-vis de la prédissociation. Les contributions des corrections diabatiques et adiabatiques à ces résultats sont discutées. Abstract 2014 Bound and quasi-bound states of mesic molecular ions have been calculated in the framework of the Born-Oppenheimer approximation. The energy levels, potential humps, and lifetimes with respect to predissociation of He03BC+ and Ne03BC+ quasi-bound states are determined. Diabatic and non adiabatic corrections are estimated and discussed.

First spectroscopic evidence for a muonium-containing molecule: NeMu* chemiluminescence

“…This assessment of the lifetime of the radiating species points strongly towards an electronic state and rules out the possibility of contributions from long-lived excited vibrational species, such as NeMu+ (calculated to have radiative lifetimes which are typically tens of microseconds). 33,61 The observed high photon yields are consistent then with the calculated 4 ns lifetime given in the previous section, which is indeed much shorter than the muon decay lifetime. However, this lifetime is also much shorter than the rise time of the experimental NeMu* chemiluminescent signal, in seeming contradiction with the kinetics model presented earlier.…”

“…of Mu. 33 Chemical evidence from earlier ,u.SR studies of NeMu+ show that it is formed highly vibrationally excited. 34 If we assume maximum excitation (i.e., essentially an unbound muon), then 13.6-4.2=9.4 eV of energy above Ne + Mu are available to the system.…”

Non-Born–Oppenheimer study of the muonic molecule ion 4He μ+*

“…Later, using the model of charge exchange collisions, Senba [15] well explained the experimental observation of Fleming et al In addition, the slowing-down process of µ + in gas mixtures He-Ar and He-H 2 , the process during which µ + is slowed from its initial MeV kinetic energy down to ∼ 10 eV by collisions with gas atoms, was also studied by Senba. [16] The calculation [17] of 4 He µ + was performed by Fournier and Lassier-Govers in 1982 using the Born-Oppenheimer (BO) potential for He H + reported by Kolos and Peek [18] and combining with the appropriately mass-weighted adiabatic corrections calculated by Bishop and Cheung. [19] In 1984, Fournier and Le Roy improved their calculations for all bound levels of 4 He µ + using a new interpolation procedure for the BO potential.…”