The Schumann‐Runge O2 Emission, Following Visible Multiphoton Excitation of NO2
Open Access
- 19 July 1982
- journal article
- research article
- Published by Wiley in Laser Chemistry
- Vol. 1 (2) , 113-130
- https://doi.org/10.1155/lc.1.113
Abstract
The Schumann-Runge emission (B3u X3g) of oxygen was observed in the wavelength range of 220–300 nm, when NO2 was irradiated with a focused visible laser (470–580 nm). The excitation spectrum of the emission also showed the Schumann-Runge transition from highly excited vibrational levels (v″ = 22–26) of the X state to the v′ = 1–3 levels of the B state of oxygen. The highly vibrationally excited O2 (Evib ≃ 30000 cm−1) is once produced through a multiphoton process of NO2 and then absorbs one more photon. The resulting excited state of O2 emits fluorescence in the UV region. Even at 40 torr of NO2, no rotational-vibrational relaxation in the B state was observed. The mechanism of the multiphoton process is discussed.Keywords
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