Abstract The Antiproton Decelerator (AD) facility of CERN began operation in 1999 to serve
experiments for studies of CPT invariance by precision laser and microwave spectroscopy of …

Highly accurate results from frequency measurements on neutral hydrogen molecules H 2,
HD, and D 2 as well as the HD+ ion can be interpreted in terms of constraints on possible …

An overview is presented of the H 2 quasar absorption method to search for a possible
variation of the proton-electron mass ratio μ= mp/me on a cosmological time scale. The …

The fundamental ground tone vibration of H 2, HD, and D 2 is determined to an accuracy
of<? format?> 2× 10-4 cm-1 from Doppler-free laser spectroscopy in the collisionless …

The transition wave number from the EF Σ 1 g+(v= 0, N= 1) energy level of ortho-H 2 to the
54 p 1 1 (0) Rydberg state below the X+ Σ 2 g+(v+= 0, N+= 1) ground state of ortho-H 2+ has …

The dissociation energy of molecular hydrogen is determined theoretically with a careful
estimation of error bars by including nonadiabatic, relativistic, and quantum electrodynamics …

Spectroscopy of hydrogen can be used for a search into physics beyond the Standard
Model. Differences between the absorption spectra of the Lyman and Werner bands of H 2 …

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 …

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

The transition wave numbers from selected rovibrational levels of the EF Σ 1 g+(v= 0) state to
selected np Rydberg states of ortho-and para-D 2 located below the adiabatic ionization …