The Metastable 2p3-State of Mercury Atoms

TIHE METASTABLE 2p3-STATE OF MfERCURY ATOMS

Equation of State for Mercury

An analytical equation of state by Song and Mason is developed to calculate the PVT properties ofmercury. The equation of state is based on the statistical-mechanical perturbation theory of hard convexbodies and can be written as a fifth-order polynomial in the density. There exists three temperaturedependentparameters in the equation of state; the second virial coefficient, an effective molecu...

Laser spectroscopic studies of state-dependent collisional quenching of the lifetimes of metastable antiprotonic helium atoms

A laser spectroscopic method was developed to directly observe the lifetimes of individual states in metastable antiprotonic helium atoms ( p̄ He). Collisional effects with surrounding helium atoms were studied in cryogenic gas targets at pressures between 0.1 and 9.0 bars and at temperatures between 5.5 and 7.0 K. The metastable state (n ,l )5(39,35) showed a lifetime of 1.5 ms, regardless of d...

Spin-dependent collision of ultracold metastable atoms

Spin-polarizedmetastable atoms of ultracold ytterbium are trapped at high density and their inelastic collisional properties are measured. We reveal that in collisions of Yb(P2) with Yb(S0) there is relatively weak inelastic loss, but with a significant spin dependence consistent with Zeeman sublevel changes as being the dominant decay process. This is in strong contrast to our observations of ...

Ultracold collisions of metastable helium atoms

We report scattering lengths for the Σg , Σu and Σg adiabatic molecular potentials relevant to collisions of two metastable 2 3S helium atoms as a function of the uncertainty in these potentials. These scattering lengths are used to calculate experimentally observable scattering lengths, elastic cross sections and inelastic rates for any combination of states of the colliding atoms, at temperat...