Abstract
We have studied orbital alignment effects in a single supersonic jet. The Ar gas behind the nozzle is used as both the collision partner and the carrier gas for free jet expansion. The Ca 4s5p 1P 1 state is prepared by a linearly polarized laser. By varying the angle of the laser polarization with respect to the relative velocity vector of the Ca and Ar collision, either the asymptotic Σ or Π molecular state related to the Ca—Ar collision can be prepared and followed. The measurement of polarization upon the Ca(4s5p 1P 1→4s5p 3P J ) spin-changing collision by Ar gives a value of 19%±1.5% at a background pressure of about 55 mTorr. The result is in excellent agreement with the crossed-beam value 21%±7% of Leone and co-workers.
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