Angular resolution and isotope studies for inversion relaxation in NH 3

J. R. Williams, S. G. Kukolich

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Inversion relaxation cross sections for the J = 3, K = 2 upper state of NH3 were measured using a beam maser spectrometer. Scattering gases were NH3, ND3, HCl, and H2O. For NH 3-NH3 scattering the angular resolution was varied from 1.5° to 0.2° with little effect on cross sections. Cross sections for NH3 and ND3 as scattering gases were equal within experimental error. The result that beam maser cross sections are relatively independent of angular resolution is discussed. Calculated angular resolution corrections are compared with values of beam attenuation cross sections and total cross sections obtained from the present data. Comparison is made between our pure state (σI) and superposition state (σII) cross sections and recent T1 and T2 gas-cell data.

Original languageEnglish (US)
Pages (from-to)251-255
Number of pages5
JournalThe Journal of chemical physics
Issue number1
StatePublished - 1976

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Angular resolution and isotope studies for inversion relaxation in NH 3'. Together they form a unique fingerprint.

Cite this