Lifetimes of Vibro-Rotational Levels in Excited Electronic States of Diatomic Hydrogen Isotopologues

Abstract

Current situation in studies of lifetimes of excited rovibronic levels for the H 2 , D 2 , T 2 , HD, HT, and DT molecules is analyzed. All measured values of the lifetimes, reported before November 2014, are compiled and listed in the tabular format together with annotated bibliography. Experimental data are now available for the H 2 , HD and D 2 molecules only. The data collected in the present work show fragmentariness of experimental data. For vast majority of the levels the lifetime value was reported in one paper only, and has no independent experimental verification. Complete bibliography of publications concerning semi-empirical determination and non-empirical calculations of the lifetimes is presented. Numerical results obtained by these two approaches are listed in an explicit form only in the cases when experimental data are available. For more than half of the levels the differences between measured and calculated values are 3 times higher than experimental errors. This direct contradiction shows necessity of more precise experimental and non-empirical studies. For finite number of rovibronic levels our analysis made it possible to propose certain set of recommended data.

Nonadiabatic effects on the positions and lifetimes of the low-lying rovibrational levels of the GK 1Σ+g and H 1Σ+g states of H2

“…Both decay mechanisms are expected to also reflect nonadiabatic effects but no full theoretical treatments have been reported so far. Recently, Astashkevich and Lavrov 20 have presented a detailed review of the current knowledge on the lifetimes of excited states of molecular hydrogen and pointed at numerous deficiencies and the need for additional experimental § Because only singlet low-lying electronic states are considered in this work, we use the quantum number N of the total angular momentum without spin to label the rotational states instead of the quantum number J of the total angular momentum without nuclear spin. studies.…”

Dissociation Energy of the Hydrogen Molecule at 10−9 Accuracy

“…To reduce AC Stark effects, this laser is delayed by 30 ns with respect to the 179-nm pulse. Further increase of the delay is detrimental because the lifetime of the GK(1,1) state is 24(3) ns [23]. The H + 2 ions are collected and detected by the velocity-map-imaging method [24].…”

Photoionization of hydrogen molecular ion by ultrashort photo-pulse in a wide range of field magnitudes

“…The usage of this symbol in (1) yields the total probability of all inelastic transitions since the transition into initial state is excluded by means of parameter (2). The projector into entire continuum can be represented by subtracting from the identity operator the projector to all states of the discrete spectrum.…”

“…The process of photoionization of atoms and molecules is of great importance in various plasma media, for example, in astrophysical plasma, where hydrogen is of especial interest ([1]; also see bibliography in [2]). It has been studied for a long time, however the interest to this process resumed in connection with development of ultrafast strong field radiation sources.…”