Simple Low-Outgassing Atomic Hydrogen Source

SOURCE OF ATOMIC HYDROGEN IN THE ATMOSPHERE OF HD 209458b

Atomic hydrogen loss at the top of HD 209458b’s atmosphere has been recently suggested (Vidal-Madjar et al.). We have developed a one-dimensional model to study the chemistry in the upper atmosphere of this extrasolar “hot Jupiter.” The three most abundant elements (other than He) as well as four parent molecules are included in this model, viz., H, C, O, H2, CO, H2O, and CH4. The higher temper...

Turbulence in Atomic Hydrogen

Understanding the properties of interstellar turbulence is a great intellectual challenge and the urge to solve this problem is partially motivated by a necessity to explain the star formation mystery. This review deals with a recently suggested inversion technique as applied to atomic hydrogen. This technique allows to determine 3D turbulence statistics through the variations of 21 cm intensit...

Cryopumping of atomic hydrogen

A high-density ultracold spin polarized atomic hydrogen jet’ will be used as an internal target for the experiments NEPTUN and NEPTUN-A,2 which will study spin effects in proton-proton scattering at energies of 400 GeV and 3 TeV at the UNK accelerator being built at Protvino, USSR. The ultimate intensity goaI of this jet is a polarized beam of 10” atoms/s. In order to keep the vacuum pressure i...

Transition between fragmentation and permeable outgassing of low viscosity magmas

Explosive volcanic eruption requires that magma fragments into discrete parcels. Silicic magma can fragment through brittle failure or other processes that depend on the viscoelasticity of the melt. Owing to the low viscosity of basaltic magmas, however, the fragmentation mechanism must be different and will be governed by fluid mechanics alone. We perform a series of decompression experiments ...

Two-Center Effect on Low-Energy Electron Emission in Collisions of 1-MeV/u Bare Ions with Atomic Hydrogen, Molecular Hydrogen, and Helium. I. Atomic Hydrogen