Pressure-induced multiphoton ionization of krypton–argon mixtures at 248 nm

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Abstract
Pressure‐induced three‐photon ionization of Kr atoms at 248 nm has been examined in mixtures involving Ar and Ne. This density‐dependent effect is attributed to the role of a two‐photon near resonance, which, although forbidden by parity in the free atom, acquires an allowed character in the two‐center molecular system. The response of Ar/Kr mixtures was greater than that observed in pure krypton. It was found that these effects reveal both the detailed structure of the near‐resonant molecular states and the variation of the participating matrix elements with internuclear separation. It was also determined that the three‐body recombination of Kr* to Kr*2 when assisted by Ar, is governed by a rate constant whose value is (3.0±0.7) ×10−32 cm6/sec.