ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The electric power consumed by hot tantalum and tungsten filaments used to dissociate hydrogen molecules into hydrogen radicals was measured at filament temperatures of 2000, 2300, and 2500 °C and hydrogen pressures from 0.5–100 Torr. The measured power consumption at pressures above 30 Torr was well represented by a model that assumed thermodynamic equilibrium between H2 and H near the filament. With decreasing pressure, however, the dissociation of H2 shifted from an equilibrium-controlled regime to a surface-reaction-rate controlled regime. The relationship between the power consumption and the pressure in the surface-reaction-rate controlled regime was correlated with the surface dissociation probability, which was determined to range from 0.18 to 0.94. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.359015
