Abstract
The rotational relaxation of N 2 in collisions with He has been investigated in free jets with a combination of resonance-enhanced-multiphoton ionization spectroscopy and time-of-flight techniques. From the measured data, a global cross-section for rotational relaxation has been derived. The cross section grows from a value of ≈8 A ̊ 2 at 100 K to ≈18 A ̊ 2 at 5–15 K. For the weakest supersonic expansions investigated, a breakdown of the translational equilibrium between He and N 2 has been observed, that could be well accounted for by an isentropic jet model and classical collision cross-sections.
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