Double Resonance Studies of Collision-Induced Transitions in a Molecular Beam

  • T. Shimizu
  • F. Matsushima
  • Y. Honguh
Conference paper
Part of the Springer Series in Optical Sciences book series (SSOS, volume 30)


Various types of collision—induced transitions occur among molecular levels. Relevant molecular energy levels and transitions among them are schematically shown in Fig.l and 2. The α- and β-transitions, named by Oka on his microwave-microwave double resonance experiments [1], are the collision-induced transitions between rotational levels and inversion doubling levels, respectively. Transitions between vibrational levels mostly occur as a V-V energy transfer, because an energy discrepancy at the collision is too large to be absorbed by a translational degree of freedom [2]. Since the rotational state has a dual parity in a case of symmetric top molecule, direct transitions between closely spaced M-sublevels occur.

Figure 1

Double resonance in the vibration-rotation-inversion levels of NH3

Figure 2

Double resonance detection of collision-induced transitions between i1-sublevels of CH3 F


Molecular Beam Rotational State Double Resonance Rotational Level Resonance Tuning 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1981

Authors and Affiliations

  • T. Shimizu
    • 1
  • F. Matsushima
    • 1
  • Y. Honguh
    • 1
  1. 1.Department of PhysicsUniversity of TokyoBunkyo-ku, Tokyo 113Japan

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