Molecular beam maser measurements of relaxation cross sections in NH3

Stephen G Kukolich, J. H S Wang, D. E. Oates

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Direct measurements of scattering cross sections for NH3 in well-defined quantum states are made using a molecular beam maser spectrometer. Cross sections are compared for a pure inversion state with those for a coherent superposition state for scattering gases He, Ar, N2, N2O, NH3, CH3H and CH3CN. The cross sections are significantly larger for scattering of the pure inversion state by NH3, CF3H and CH3CN than for scattering of the superposition state. The scattering is the same for both states on non-polar gases. These cross sections are related to relaxation parameters describing transitions between rotation and inversion states.

Original languageEnglish (US)
Pages (from-to)519-524
Number of pages6
JournalChemical Physics Letters
Issue number6
Publication statusPublished - Jul 15 1973
Externally publishedYes


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

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