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Binary-collision-induced longitudinal relaxation in gas-phase 83Kr.

Zackary I Cleveland1, Thomas Meersmann

  • 1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.

The Journal of Chemical Physics
|January 7, 2009
PubMed
Summary

Spin exchange optical pumping enhanced NMR sensitivity for krypton-83, enabling rapid data collection. This study quantifies krypton-83 relaxation in pure krypton and krypton-buffer gas mixtures.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Atomic and Molecular Physics
  • Gas Phase Dynamics

Background:

  • NMR relaxation studies of noble gases offer unique insights complementary to molecular gas studies.
  • Conventional noble gas NMR faces challenges due to low sensitivity and long relaxation times.
  • The quadrupolar nucleus krypton-83 (Kr-83) presents an opportunity for NMR investigations.

Purpose of the Study:

  • To overcome the low sensitivity of Kr-83 NMR using spin exchange optical pumping.
  • To measure the density dependence of longitudinal relaxation times (T1) for Kr-83 in pure krypton.
  • To investigate the effects of buffer gases (helium and nitrogen) on Kr-83 relaxation and determine collision-induced relaxation efficiencies.

Main Methods:

  • Utilized spin exchange optical pumping to enhance the sensitivity of Kr-83.
  • Performed density dependent NMR relaxation measurements on pure krypton gas.
  • Conducted experiments on krypton-helium and krypton-nitrogen gas mixtures at varying compositions and densities.

Main Results:

  • Achieved rapid collection of Kr-83 relaxation data due to long T1 times (40-400 s).
  • Determined the density dependence of Kr-83 longitudinal relaxation in pure krypton to be approximately 1.6 x 10(-3) amagat(-1) s(-1).
  • Quantified the density dependence of buffer gas induced relaxation and the relaxation efficiency of Kr-83-buffer gas collisions.

Conclusions:

  • Spin exchange optical pumping effectively overcomes sensitivity limitations for Kr-83 NMR.
  • The study provides quantitative data on Kr-83 relaxation in pure and mixed gas environments.
  • Results offer valuable parameters for understanding noble gas interactions and relaxation mechanisms in gas phase.