Knowledge Bank

The flame reaction $Sr+N2O$ was investigated in a Broida-type oven by using laser excitation spectroscopy and dispersing the laser induced fluorescence with a 1/3m - monochromator. Previously reported results about a transition near 16852 $cm-1$ involving a new triplet state at about 26300 $cm-1$ above the ground state could be improved. A new bandhead at 16846 $cm-1$ was found and could be assigned to the transition $A\prime$ $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\pi$ - B $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\pi$. The observed wavelength of the bandhead is in good agreement with the value calculated from molecular data published by other groups [1]. Fluorescence from the B $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\pi$ state into another excited state at about 9000 $cm-1$ above the ground state was observed (probably a $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\sum$ state). [1] K. P. Huber and G. Herzberg, Molecular Soectra and Molecular Structure"", Vol. IV, ""Constants of Diatomic Molecules, Van Nostrand-reinhold, New York 1979.