Triplet4dstates ofH2: Experimental observation and comparison with anab initiomodel for Rydberg-state energies

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

“…28 The transition to the Rydberg state is characterized by In order to estimate the energy of the rotational Rydberg states we used an ab initio model described by Eyler and Pipkin. 11 This model has been successfully applied. 7,12 In brief, the lowest-order couplings that perturb the Rydberg electron from hydrogenic energies are considered.…”

“…They observe a weak dependence of these constants on the rotational quantum number and a stronger dependence on the vibrational level. 11 We note that Eq. ͑4͒ only accounts for the effect of the longrange forces felt by the Rydberg electron and does not take into account the penetration of the electron from the ionic core.…”

“…9,10 For these reasons, most studies in triplet hydrogen have focussed on the d-gerade Rydberg series. [11][12][13] To the best of our knowledge no triplet np-ungerade Rydberg series have been detected. Using microwave spectroscopy, Lundeen and coworkers have measured high-resolution spectra of nonpenetrating high l states.…”

Decay of high Rydberg states: A paradigm for intramolecular dynamics in a congested bound level structure coupled to a continuum

“…Here the same point will be made in a purely quantal framework and extensive computational results will be provided. Our work is thus a continuation of studies which used a quantal scattering approach to the electron core coupling [40][41][42][43][44][45][46] and, in addition, it allows for the role of an external dc field.…”

Spectral identification of diffuse resonances in H2 above the n = 2 dissociation limit

“…The quantum states of triplet symmetry have been investigated over many decades; we refer to the metastable c 3 u , v = 0 state discovered by Lichten, 1 later used to perform high-resolution laser spectroscopic studies, 2 and the studies on dissociation in the triplet manifold. 3,4 The spin-orbit interaction between levels of singlet and triplet symmetry is very small, to the extent that for a long time the separation between singlet and triplet quantum levels was erroneously deduced.…”