Aerodynamical acceleration and rotational-vibrational temperatures in seeded supersonic molecular beams

摘要: Abstract The time-of-flight (TOF) technique was used to study the aerodynamical acceleration in seeded supersonic molecular beams of heavy molecules and light seeding gas. We also studied correlation between degree aerodynamic achieved, rotational-vibrational temperatures as measured using laser-induced fluorescence (LIF) technique. velocity slip (difference) helium hydrogen carrier gases iodine aniline determined free-jet expansion by TOF measurements compared with rotational LIF. translational temperature found be abnormally high dependent on teh heavy-molecule concentration, even at concentration low 400 ppm. In case it that degrees freedom were equilibrated or gas temperatures, although this more than an order magnitude higher theoretical predictions obtained for pure-gas expansion. aniline, is gas-dynamic relaxation incomplete. kinetic energy increases linearly light-gas pressure up = 50% its maximum available energy. possibility making accurate kinetic-energy LIF discussed. It claimed existence can largely effect calculations concerning vibrational beams.