The yield of resonance fluorescence of Na in a flame

摘要: With good approximation the homogeneous part of a gas flame above first combustion zone is in thermal equilibrium .This equilibrium, however, does not apply to radiation density as emission by compensated irradiation, and at most wavelengths self-absorption negligible. Notwithstanding this exception, population energy levels adequately described Boltzmann formula, because mainly collision processes account for transitions other levels. Accordingly, excitation temperature describing an excited state but slightly lower than translation colliding molecules. The which these temperatures are equal with, depends on number radiative divided total from level concerned. This ratio may be determined measuring fluorescence yield. result reported here has been obtained with resonance fluorescence. By combining measured yield absolute probabili ty transition (which known experiments), collisional found. collisions causing transi t ion also interesting when broadening corresponding spectral line being considered.