Gerade/ungerade symmetry- breaking in HD at the n =2 dissociation limit
We report on a study of the I'1Πg outer well state of HD. Via a resonance-enhanced XUV + IR (extreme ultraviolet + infrared) excitation scheme, rovibronic levels (v = 0-2, J = 1-4) are populated and probed by pulsed lasers. Level energies are measured with an accuracy of 0.03 cm-1. Due to gerade-ungerade symmetry breaking, the long-range behavior of the I' potential in HD deviates from that of H2 and D2. When this deviation is taken into account a semi-empirical potential for the I'1Πg state may be constructed, resulting in better agreement with the observed level energies than derived from an adiabatic ab initio potential. With this new potential it is predicted that the I' well can sustain only 4 vibrational levels, with the v = 3 level having a binding energy of 1.38(3) cm-1. PACS Nos.: 33.80.Rv, 34.20.Cf, 33.20.Ni, 31.50.+w
Dissociation energies of the hydrogen and deuterium molecules.
Fluorescence-excitation spectroscopy near [similar to]84 nm has been used to measure the threshold for the dissociation of H[sub 2]([ital B][prime] [sup 1][Sigma][sub [ital u]][sup +])=H(1[ital s])+H(2[ital s]) at 118 377.06[plus minus]0.04 cm[sup [minus]1] and the corresponding limit for D[sub 2] at 119 029.72[plus minus]0.04 cm[sup [minus]1]. The onset of dissociation was observed clearly, free from overlapping molecular lines, by the use of delayed quenching of 2[ital s] atoms produced by the photoexcitation pulse. These measurements have yielded the values [ital D][sub 0](H[sub 2])=36 118.11[plus minus]0.08 cm[sup [minus]1] and [ital D][sub 0](D[sub 2])=36 748.38[plus minus]0.07 cm[sup [minus]1] for the dissociation energies of the ground electronic states [ital X] [sup 1][Sigma][sub g][sup +], in agreement with the latest [ital ab] [ital initio] calculations, which include nonadiabatic, relativistic, and radiative corrections. From the present values and recently determined ionization energies of H[sub 2] and D[sub 2], the dissociation energies of the respective ions were found to be [ital D][sub 0](H[sub 2][sup +])=21 379.37[plus minus]0.08 cm[sup [minus]1] and [ital D][sub 0](D[sub 2][sup +])=21 711.64[plus minus]0.07 cm[sup [minus]1], also in agreement with recent [ital ab] [ital initio] calculations.
A Phenomenological Study of the Wind Band Experience: Stories of Band
A PHENOMENOLOGICAL STUDY OF THE WIND BAND EXPERIENCE: