Rydberg levels, bound

From these values, wavelength ranges to search for bound Rydberg series with field or collisional ionization or to search for autoionizing series converging to excited states of the ion were estimated for various parent levels that could be conveniently populated by one or two-step excitation. The threshold determinations reduced the search ranges for Rydberg levels to reasonable values. Scans were made from various parent levels until series were obtained. 

Often it is possible to tune the ionizing laser L2 to transitions from k) into au-toionizing Rydberg levels (Sect. 5.4). For such transitions the probability may be from two to three orders of magnitude larger than for bound-free transitions into the ionization continuum. In these cases the requirement (1.48) can be met even at much lower intensities of L2. 

V. Engel Let me come back to the distribution of lifetimes of the ZEKE Rydberg states. I wonder if there is a simple picture behind. Consider a much simpler molecule, namely the Nal molecule Prof. Zewail told us about. There you have a bound state coupled to a continuum. It can be shown that in such a system the lifetimes of the quasibound states oscillate as a function of energy. In fact, Prof. Child showed with the help of semiclassical methods that there are lifetimes ranging from almost infinity to zero [1]. That can be understood by the two series (neglecting rotation) of vibrational levels obtained from the adiabatic and diabatic picture. If two energy levels of different series are degen-... 

Ba Rydberg energy levels (—) and continua (///) obtained by adding the second valence electron to these Ba+ levels. The horizontal arrows show the possible interactions between channels associated with different ion levels. Interactions with other bound states lead to series perturbations while interactions with continua lead to autoionization. 

Fig. 20.1 A three channel, three limit problem. Three levels of the ion, shown by the bold lines, have Rydberg series converging to them from below and continua above them. The interactions between the series are shown by the horizontal arrows. Bound-continuum interactions are shown by single headed arrows while bound interactions are shown by...

Situations favourable to the emergence of chaos are those in which a dense manifold of bound Rydberg states is subject to perturbations of a strength comparable to the level spacing. This can occur mainly close to the first ionisation threshold and in the first autoionising range. 

Figure 5.5 Semiclassical calculation of vibrational overlap integrals between successive vibrational levels of the N2 c 1E J Rydberg state and the bound region of the b Sj valence state where the vibrational energy in the b -state is treated as a continuous variable. Both states are represented by Morse potentials. The zero of energy is taken as v = 0, J = 0 of b 1 ). For the E values corresponding to the bound vibrational levels of the b Sj state, the values calculated using Eq. (5.1.12) reproduce the exact values (Table V of Lefebvre-Brion, 1969) to two decimal places. (Courtesy R. Lefebvre.)...

Figure 7.25 Example of 2n 2n Rydberg vaJence electrostatic interaction in NO. The v = 0 and 1 levels of the 5pir Q2I1 Rydberg state are perturbed by bound levels (u = 29 and 35) of the B2n valence state, but the v > 2 levels of Q2n are predissociated by the continuum of the same B2II state. (Adapted from Gallusser and Dressier (1982).]...

In the case of aliphatic organochlorine molecules, the strength of the interactions between Cl and C, and the coordination environment around the linking C atom will influence the energy levels of the a orbitals. These bound state transitions exhibit intense features when compared to the spectral features of the gas phase molecules discussed earlier. The Rydberg transitions, which are distinct in small chain gas phase molecules, are broader and of much lower intensity when these molecules are present in a... 

Fig. 8. 37 Photoassociation of collision pairs, (a) Energy level scheme for the excitation of a collision pair into bound Rydberg states, (b) experimental arrangement with crossed atomic...

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