Mechanism for decay and spontaneous radiative decay constants of the lowest-lying attractive excited states of Ne2, Ar2, and Kr2

Abstract

Articles you may be interested inNonradiative decay of the lowest excited singlet state of 2-aminopyridine is considerably faster than the radiative decay

Scintillation yield and time dependence from electronic and nuclear recoils in liquid neon

“…A very slow tail in the solid has also been observed with a lifetime of 560 μs, attributed to excitations of the 3s 3 12 P 2 atomic state [8]; in one measurement of the liquid, an excited atomic triplet state was observed to decay nonexponentially, disappearing within several microseconds [43]. Measurements in gaseous neon suggest that long-lived 1 P 1 and 3 P 1 atomic states can react via three-body collisions to form radiative molecular states [45]; the lifetime of the long-lived molecular state in gas, presumably equivalent to the triplet state, was measured to be 6.6 μs [46]. Lastly, as the temperature of the gas is reduced, the emission due to molecular states disappears, leaving only the atomic spectra behind [8].…”

Calcul théorique en couplage Λ-Σ du spectre électronique des excimères Ar2 et Kr2 corrélé aux configurations atomiques np5(n + 1) s et np5( n + 1) p

“…Du point de vue th6orique, en dehors des estimations de Mulliken [11] illustr6es sur 1'exemple de Xe*, reprises par d'autres auteurs pour Ar* [12,13] et Kr* [14], seuls ont 6t6 publi6s a 1'heure actuelle les calculs d'lwata impliquant la configuration 2p' 3p du neon, ainsi qu'une etude preliminaire a vocation m6thodologique portant sur le croisement des 6tats g de Ar* corr6l6s aux configurations 3p' 4s et 3p' 4p par Teichteil et l'un des auteurs [15]. L'application directe de ces deux etudes concemait essentiellement 1'assignation des spectres d'absorption IR, motiv6e par les resultats exp6rimentaux de Oka et al [16,17]. En dehors des travaux precedents, les etudes spectroscopiques exp6rimentales restent parcellaires.…”

Trace Detection of Metastable Helium Molecules in Superfluid Helium by Laser-Induced Fluorescence

“…A theoretical value of 18 s for the lifetime of He 2 (a 3 Σ + u ) in the lowest vibrational state has been obtained by assuming the spin flip is driven by spin-orbit (SO) coupling and treating the Breit-Pauli spin-orbit Hamiltonian using first order perturbation theory [15]. The lifetimes of the lowest-energy triplet molecular states in neon, argon, krypton, and xenon are much shorter, measured to be 6.6 µs, 3.2 µs, 350 ns, and 50 ns respectively [16]. The large difference between the lifetimes of helium and the heavier noble gases is qualitatively due to the respective strengths of the SO coupling, which scales roughly as Z 4 .…”