Excitation ahead of shock fronts in krypton measured by single line laser absorption
Abstract
The number densities of the metastable 5s[1 1/2]2 state and the 5s[1 1/2]1 state of krypton ahead of shock fronts have been determined from the measured absorption of single line laser radiation. Shocks with Mach numbers from 12 to 21 were investigated at preshock pressures from 0.7 to 2.7 kPa. An exponential rise of this excitation precursor having time constants of about 8 ws is found. The metastable concentration at M = 20 is about 10 ppm. The experimental results agree within an order of magnitude with published model predictions for argon and xenon shocks.
- Publication:
-
Experiments in Fluids
- Pub Date:
- December 1984
- DOI:
- 10.1007/BF00571860
- Bibcode:
- 1984ExFl....2..177B
- Keywords:
-
- Absorption Spectra;
- Dye Lasers;
- Krypton;
- Molecular Excitation;
- Shock Fronts;
- Argon;
- Data Reduction;
- Line Spectra;
- Mach Number;
- Metastable State;
- Shock Tubes;
- Tunable Lasers;
- Xenon;
- Atomic and Molecular Physics