Lebensdauern und Löschquerschnitte elektronisch angeregter Zustände von N2O+, NO, O2 +, CO+ und CO

Abstract

Radiative lifetimes of electronically excited states of N₂O⁺, NO, O₂ ⁺, CO⁺, and CO are measured by means of the phase-shift method. Excitation is performed by a modulated electron beam. Phase references are derived from He I, N₂ ⁺, and CO⁺ transitions as well as from another independent method based on the very short decay time of the air fluorescence. Measurements are performed on the transitions N₂O⁺ (B² ∑_u ⁺ ➝ X² II_g), NO (A² ∑⁺ ➝ Χ² II), O₂ ⁺ (b⁴ Σ_g ^- ➝ a⁴ II_u), O₂ ⁺ (A² II_u ➝ X² II_g), CO⁺(B² ∑ ➝ X² ∑), CO⁺ (B² ∑ ➝ A² II) , CO⁺ (A² II ➝ X² ∑), CO (b³ ∑⁺ ➝ a³ II), CO (B¹∑⁺ ➝ A¹ II). As far as feasable lifetimes of individual vibrational levels are measured. From the pressure dependence of the decay rates cross-sections for the quenching of the excited states by the parent molecules are obtained.