Vol. 3, issue 08, article # 8

Losev L. L., Soskov V. I. Nonlinear photoionization of air in the spectral interval 355-200 nm. // Atmospheric and oceanic optics. 1990. V. 3. No. 08. P. 772-776. PDF
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Abstract:

The nonlinear photoionization of air was investigated with the help of a UV laser, discretely tunable in the range 355-200nm. It was found that two-step ionization of nitrogen and oxygen occurs at wavelengths in the range 355-200nm while two-photon ionization of oxygen occurs at wavelengths λ<205 nm. It is shown that in the case of the two-step process the cross section for photoionization decreases as the gas pressure increases.

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