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Intensity enhancement of weak O a Δ →X Σ emission at 1270 nm by collisions with foreign gases

Journal of Physical Chemistry A, ISSN: 1089-5639, Vol: 116, Issue: 9, Page: 2032-2038
2012
  • 11
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  • 8
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Metrics Details

  • Citations
    11
    • Citation Indexes
      11
  • Captures
    8

Article Description

Collision-induced near-IR emission of O a Δ was investigated in O /M (M = Ar, Kr, Xe, N , or CO ) gas mixtures, where the total pressure ranged from 10 to 100 atm, and gaseous O dimol was excited with a pulsed dye laser at 630 nm through the simultaneous two-electron transition to prepare O in the a Δ state. The a Δ → X Σ emission intensity around 1270 nm increased with the number density of foreign gas (M) under constant O number density. Emission enhancement efficiencies were in the order Xe > CO > O > Kr > N > Ar; they are controlled by collisional enhancement during the near-IR emission at 1270 nm but not during photoabsorption at 630 nm. Efficiencies were converted into bimolecular rate constants to enhance the radiative a → X transition for the added gases. The rate constants were estimated as quadratically dependent on the molar refraction (or polarizability) of collision gas. The self-quenching rate constant was determined from the Stern-Volmer plot of the emission lifetimes measured in pure O . © 2012 American Chemical Society.

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