Vacuum Ultraviolet Absorption Measurements of Atomic Oxygen in a Shock Tube

Vacuum Ultraviolet Absorption Measurements of Atomic Oxygen in a Shock Tube

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Description

The absorption of vacuum ultraviolet light by atomic oxygen has been measured in the Electric Arc-driven Shock Tube (EAST) Facility at NASA-Ames Research Center. This investigation demonstrates the instrumentation required to determine atomic oxygen concentrations from absorption measurements in impulse facilities. A shock wave dissociates molecular oxygen, producing a high temperature sample of atomic oxygen in the shock tube. A probe beam is generated with a Raman-shifted ArF excimer laser. By suitable tuning of the laser, absorption is measured over a range of wavelengths in the region of the atomic line at 130.49 nm. The line shape function is determined from measurements at atomic oxygen densities of 3 x 10(exp 17) and 9 x 10(exp 17) cm(exp -3). The broadening coefficient for resonance interactions is deduced from this data, and this value is in accord with available theoretical models.
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Product details

  • Paperback | 144 pages
  • 189 x 246 x 8mm | 268g
  • United States
  • English
  • 1288916175
  • 9781288916177