Absolute ground state atomic hydrogen densities were measured, by the utilization of two-photon absorption laser induced fluorescence, in a low-pressure electron cyclotron resonance plasma as function nitrogen admixtures—0 to 5000 ppm. At admixtures 1500 ppm and higher, spectral distribution fluorescence changes from single Gaussian double distribution; this is due separate, nascent contributio...

Dimension eight operators of the Weinberg type have been shown to give important contributions to CP violating phenomena, such as the electric dipole moment of the neutron. In this note we show how operators related to these (and expected to occur on equal footing) can give rise to time-reversal violating phenomena such as atomic electric dipole moments. We also estimate the induced parity viol...