Autoionization Rates and Energy Levels of Rydberg Hydrogen Molecules.

We report here the first observation of ${\mathrm{Na}}_{2}$ Rydberg states with an excited ${\mathrm{Na}}_{2}^{+}$ 1 $^{2}\mathrm{\ensuremath{\Pi}}_{\mathit{u}}$ The principle of our experiment is to prepare a Rydberg state associated with the ion in its ground state and then to excite the ${\mathrm{Na}}_{2}^{+}$ core with a tunable laser. The autoionization processes occurring in these states as well as the internal energy redistribution of the singly excited Rydberg states are discussed. Finally, the energy levels of the 1 $^{2}\mathrm{\ensuremath{\Pi}}_{\mathrm{u}}$ state of ${\mathrm{Na}}_{2}^{+}$ are deduced.We report here the first observation of ${\mathrm{Na}}_{2}$ Rydberg states with an excited ${\mathrm{Na}}_{2}^{+}$ 1 $^{2}\mathrm{\ensuremath{\Pi}}_{\mathit{u}}$ The principle of our experiment is to prepare a Rydberg state associated with the ion in its ground state and then to excite the ${\mathrm{Na}}_{2}^{+}$ core with a tunable laser. The autoionization processes occurring in these states as well as the internal energy redistribution of the singly excited Rydberg states are discussed. Finally, the energy levels of the 1 $^{2}\mathrm{\ensuremath{\Pi}}_{\mathrm{u}}$ state of ${\mathrm{Na}}_{2}^{+}$ are deduced.

Physical Review LettersMar 12, 19906 citations

Study of La+ Rydberg States and Autoionization States.

The Review of Laser EngineeringJan 1, 19980 citations

Quantum mechanical calculation of Rydberg–Rydberg autoionization rates

Martin Kiffner, Davide Ceresoli, Wenhui Li +1 more

Abstract We present quantum mechanical calculations of autoionization rates for two rubidium Rydberg atoms with weakly overlapping electron clouds. We neglect exchange effects and consider tensor products of independent atom states forming an approximate basis of the two-electron state space. We consider large sets of two-atom states with randomly chosen quantum numbers and find that the charge overlap between the two Rydberg electrons allows one to characterise the magnitude of the autoionization rates. If the electron clouds overlap by more than one percent, the autoionization rates increase approximately exponentially with the charge overlap. This finding is independent of the energy of the initial state.Abstract We present quantum mechanical calculations of autoionization rates for two rubidium Rydberg atoms with weakly overlapping electron clouds. We neglect exchange effects and consider tensor products of independent atom states forming an approximate basis of the two-electron state space. We consider large sets of two-atom states with randomly chosen quantum numbers and find that the charge overlap between the two Rydberg electrons allows one to characterise the magnitude of the autoionization rates. If the electron clouds overlap by more than one percent, the autoionization rates increase approximately exponentially with the charge overlap. This finding is independent of the energy of the initial state.

arXiv:1507.03357Journal of Physics B Atomic Molecular and Optical PhysicsOct 6, 201614 citations

Study of La^+ Rydberg States and Autoionization States

Wei Sun, Ping Xue, Zhi-Ping Zhong +2 more

The Review of Laser EngineeringNov 15, 19980 citations

Technique for counting hydrogen molecules

Jan P. Hessler, Deon G. Ettinger, Wallace L. Glab

Measurements of the total yield and rotational distribution of hydrogen molecules formed in chemical reactions or emanating from a surface provide detailed information on the dynamics of these interactions. We have developed a technique which uses a two-photon resonant transition (excited with counterpropagating light beams) to the E electronic state followed by a onephoton transition to the autoionizing continuum of the molecular ion to count different isotopic species in specific rotational levels. To calculate the sensitivity and selectivity of the scheme, we have measured the radiative transition rate, the thermally averaged cross section for elastic scattering to a nearby electronic state, and the real and imaginary parts of the inelastic scattering cross section in the E state. Measurements of the total yield and rotationalMeasurements of the total yield and rotational distribution of hydrogen molecules formed in chemical reactions or emanating from a surface provide detailed information on the dynamics of these interactions. We have developed a technique which uses a two-photon resonant transition (excited with counterpropagating light beams) to the E electronic state followed by a onephoton transition to the autoionizing continuum of the molecular ion to count different isotopic species in specific rotational levels. To calculate the sensitivity and selectivity of the scheme, we have measured the radiative transition rate, the thermally averaged cross section for elastic scattering to a nearby electronic state, and the real and imaginary parts of the inelastic scattering cross section in the E state. Measurements of the total yield and rotational

Annual Meeting Optical Society of AmericaJan 1, 19890 citations

Rydberg molecules, electron collisions, and associative ionization

Chris H. Greene

Bulletin of the American Physical SocietyMay 31, 20180 citations

We report here the first observation of

{\mathrm{Na}}_{2}

Rydberg states with an excited

{\mathrm{Na}}_{2}^{+}

1 $^{2}\mathrm{\ensuremath{\Pi}}_{\mathit{u}}$ The principle of our experiment is to prepare a Rydberg state associated with the ion in its ground state and then to excite the

{\mathrm{Na}}_{2}^{+}

core with a tunable laser. The autoionization processes occurring in these states as well as the internal energy redistribution of the singly excited Rydberg states are discussed. Finally, the energy levels of the 1 $^{2}\mathrm{\ensuremath{\Pi}}_{\mathrm{u}}$ state of

{\mathrm{Na}}_{2}^{+}

are deduced.