Measurements of quenching rate coefficients of YO molecule in A2Π1/2, A2Π3/2, and B2Σ+ states by helium, argon and oxygen from a solar induced fluorescence technique

We measured in function of helium, argon, and oxygen gas pressure, the evolution of the intensities of the fluorescence spectra of YO molecule issuing from a liquid drop of yttrium oxide melted at the focus of a solar furnace. From this evolution and in a simplified approach assuming the independency of the three molecular systems of YO (A(2)Pi(1/2)-X-2 Sigma(+), A(2)Pi(3/2)-X-2 Sigma(+), B-2 Sigma(+)-X-2 Sigma(+)) we deduced, through the analysis of Stern-Volmer plots, a mean quenching rate coefficients of this molecule in these states by the above mentioned gases.