Abstract
In order to analyze high Knudsen number flows, it is important to understand the interactions of gas molecules and solid surfaces. Molecular beams have been used to study these interactions. Properties such as the translational energy and momentum of a molecular beam have been analyzed very well; however, there are very few reports analyzing the rotational energy of diatomic or polyatomic molecular beam experimentally. Resonantly enhanced multi-photon ionization (REMPI) is a spectroscopic technique, which is able to measure molecular internal energy distribution in very low density gas flows. In this study, we have detected and analyzed the rotational energy distribution in a nitrogen molecular beam by 2R+2 REMPI.
