Positronium (Ps) is an exotic hydrogenic atom composed of an electron bound to a positron
via the Coulomb force. Being composed of two low-mass leptons, positronium is, for all …

Laser cooling and trapping of atoms and atomic ions has led to advances including the
observation of exotic phases of matter,, the development of precision sensors and state-of …

The saturated absorption spectrum of the hyperfineless S (0) quadrupole line in the (2-0)
band of H 2 is measured at λ= 1189 nm, using the NICE-OHMS technique under cryogenic …

This article provides an overview of laser-based absorption spectroscopy applications and
discusses the parameter space and requirements of laser systems for each of these …

The ionization energy of ortho-H 2 has been determined to be EI o (H 2)/(hc)= 124 357.238
062 (25) cm-1 from measurements of the GK (1, 1)− X (0, 1) interval by Doppler-free, two …

We recalculate the leading relativistic corrections for the ground electronic state of the
hydrogen molecule using the variational method with explicitly correlated functions that …

The ionization energy of D 2 has been determined experimentally from measurements
involving two-photon Doppler-free vacuum-ultraviolet pulsed laser excitation and near …

The ionization energy of HD has been determined to be EI (HD)= 124 568.484 66 (7) cm− 1
by two-photon Doppler-free vacuum-ultraviolet pulsed laser spectroscopy, near-infrared …

Molecular hydrogen and its isotopic and ionic species are benchmark systems for testing
quantum chemical theory. Advances in molecular energy structure calculations enable the …

We observe that sub-GeV dark matter (DM) induces Casimir-Polder forces between
nucleons that can be accessed by experiments from nuclear to molecular scales. We …