Quenching of excited alkali atoms and related effects in flames: Part I. theoretical analysis

摘要: An a.c. photoelectric detection device has been used to determine the yield factor p of resonance fluorescence Na(5890/96) A and K(7665/99) (4044/47) doublets in atmospheric flames as a function composition temperature flame. From these measurements value (and dependence) specific effective quenching cross-sections considered lines for N2, CO2, CO, O2, H2, Ar H2O could be derived. The experimental procedure results obtained will reported discussed Part II this paper. In I theoretical analysis is given effect radiative non- equilibrium on occupation excited state, p-value, metal concentration flame, distance from flame surface. particular, an approximate expression population (or source) high density case derived by iteration assumed rectangular, Doppler Lorentzian spectral line profiles respectively. It that source independent frequency level combines with ground state only. homogeneous isothermal slab gases between two plane parallel boundaries considered. Diffusion effects atomic vapour at border are semi-quantitatively. Also intensity outgoing radiation, line-reversal temperature, shape curve growth, ratio doublet analysed. Finally, expected influence collisions broadening calculated.