Laser-microwave ionisation mass spectroscopy of ion Rydberg states: Ba⁺spectrum

Compilation of Wavelengths, Energy Levels, and Transition Probabilities for Ba I and Ba II

“…Roig and Tondello 34 observed several high-lying n f and np levels using broadband absorption in a Ba vapor created by flash pyrolysis. Boulmer et al 35 observed ns and nd Rydberg levels using laser photoionization of an atomic beam followed by laser two-photon excitation of the levels of interest. Detection of the excited atoms was achieved by microwave field ionization.…”

“…Saunders et al did not report intensities. Not included in Table 4 are a few infrared lines observed with low resolution by Isaev et al 40 As is the case for Ba I, Ba II wavelengths observed in absorption by, for example, Roig and Tondello 34 and by Boulmer et al, 35 have not been included.…”

“…A new value for the ionization energy ͑Table 5͒ of singly ionized barium has been derived by Boulmer et al 35…”

A semi-empirical model for computing radial matrix elements in one-electron atoms and ions

“…[43] and a little smaller than the theoretical values of Theodosiou [44] or Guet and Johnson [45] as may seen in Table 4. Here, better spectroscopic energies are available, and in particular the spectroscopic data by Roig and Tondello [48] and the ionization limit (80686.25 :tz 0.01 cm-1) measured by Boulmer et al [49] However, these numbers must be taken with care. 2 is not completely adequate here since the 4p wavefunctions is penetrating but has just one node inside the core, while the 3 d way-&unctions is nodeless.…”

A Single Trapped Rydberg Ion

“…Rydberg ion spectra were first studied systematically in the eighties [65][66][67]. Atoms from atomic beams were photoionised using pulsed lasers and then excited to Rydberg states via multi-photon transitions.…”