A Two-Wavelength Interferometric Measurement of the Reflection Process in an Ionizing Shock Wave

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Electron and atom number densities of partially ionized krypton behind the reflected shock waves were measured by using a two-wavelength Mach-Zehnder interferometer. Measurements were carried out for flows with an initial pressure p₁=1.5 Torr and incident shock Mach numbers M_s∼12. Electron and atom number densities in equilibrium were measured to be (2.00±0.09)×10¹⁷ cm⁻³ and (9.5±0.7)×10¹⁷ cm⁻³ respectively. These values are in good agreement with those given by theory.