Amplified spontaneous emissions of the K2 yellow and Rb2 orange diffuse bands were observed from e‐beam‐excited mixtures of K/K2 or Rb/Rb2 vapor with argon buffer gas. The continuum spectra centered at 574 and 604 nm were attributed to triplet‐triplet K2 and Rb2 23Πg→13Σu+ bound‐free transitions, respectively. The dissociative recombination of K3+ or Rb3+ is discussed as an efficient formation process of upper states by electron‐beam pumping.
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© 1992 American Institute of Physics.
1992
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