Very large hydrogen atoms, indeed

Low-cost intradermal rabies vaccination is indeed very promising.

TO THE EDITOR—We read with great interest the recent article by Wieten et al in Clinical Infectious Diseases [1] and, being involved in ongoing research strictly related to this topic, we wish to bring our contribution to their reflections. First, we fully agree that a lower-dose, abbreviated intradermal preand postexposure vaccination schedule may constitute a valid, shorter, and cheaper alter...

Very Cold Indeed: The Nanokelvin Physics of Bose-Einstein Condensation

As atoms get colder, they start to behave more like waves and less like particles. Cool a cloud of identical atoms so cold that the wave of each atom starts to overlap with the wave of its neighbor atom, and all of a sudden you wind up with a sort of quantum identity crisis known as Bose-Einstein condensation. How do we get something that cold? And what is the nature of the strange goop that re...

Microwave ionization of hydrogen atoms

Figure 1: Fraction of ionized hydrogen atoms as a function of microwave frequency , measured in units of level spacing for initially excited level ; data are obtained by numerical simulations of classical (circles) and quantum (crosses) evolution; one-photon ionization threshold is marked by (from [3]) Dima Shepelyansky (2012), Scholarpedia, 7(1):9795. doi:10.4249/scholarpedia.9795 revision #12...

Electron diffraction sees hydrogen atoms

Fast metastable hydrogen atoms from H2 molecules: twin atoms

It is a difficult task to obtain “twin atoms”, i.e. pairs of massive particles such that one can perform experiments in the same fashion that is routinely done with “twin photons”. One possible route to obtain such pairs is by dissociating homonuclear diatomic molecules. We address this possibility by investigating the production of metastable H(2s) atoms coming from the dissociation of cold H2...