Structure and interactions of ultracold Yb ions and Rb atoms

In order to study ultracold charge-transfer processes in hybrid atom-ion traps, we have mapped out the potential-energy curves and molecular parameters for several low-lying states of the Rb, Yb+ system. We employ both a multireference configuration interaction and a full configuration interaction (FCI) approach. Turning points, crossing points, potential minima, and spectroscopic molecular constants are obtained for the lowest five molecular states. Long-range parameters, including the dispersion coefficients, are estimated from our ab initio data. The separated-atom ionization potentials and atomic polarizability of the ytterbium atom (ad=128.4 atomic units) are in good agreement with experiment and previous calculations. We present some dynamical calculations for (adiabatic) scattering lengths for the two lowest (Yb, Rb+) channels that were carried out in our work. However, we find that the pseudopotential approximation is rather limited in validity and only applies to nK temperatures. The adiabatic scattering lengths for both the triplet and singlet channels indicate that both are large and negative in the FCI approximation.

The Literature of Early Modern Childhoods

The texts adapted for, printed for and marketed to children and youths in the 16th and 17th centuries, the books read by boys and girls in this period, and writings by Renaissance children constitute the literature of early modern childhoods. Yet traditional histories of children’s literature, posing narrow definitions of this genre, have largely overlooked this period. In the past decade, fresh work by early modern scholars attending to the diverse elements of the literature of early modern childhoods has flourished. This essay evaluates the absence of early modern children’s literature from early studies and considers the ways in which this recent work in Renaissance studies has vitally transformed the field through its exploration of alternative definitions of childhood and children’s literature. This work is at an early stage but it has placed the interconnections between early modern childhoods and children’s literature at the centre of both Renaissance studies and childhood studies and has established key topics for future research.