Knowledge Bank

We have studied the chemiluminescence arising from the reactions $Sr\ast +N2O\to SrO\ast +N2$ AND $Mg\ast +N2O\to MgO\ast +N2$. Atomic beams of Sr ground state $(5s2 1S)$ and low-lying Sr meta stable states ($5s5p 3po$), ($5s4d 1D$) where reacted with $N20$ in beam-gas experiment. Spectra obtained under single collision conditions consist of broad ``continuum’’ emission commencing at about 400 NM and extending into the near IR, beyond our detector range (300-900 NM); SrO are bands are seen superimposed upon this continuum. Photon yields and absolute cross section will be presented. Prominent SrO A^{\prime} $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\Pi -X1\Sigma +$ and $A1\Sigma +-X1\Sigma +$ bands are observed under multiple collision conditions. We have also investigated $Mg(3s3p 3PO)+N20+MgO\ast +N2$, but do not observe appreciable chemiluminescence. We estimate the upper limit to the chemiluminescence cross section to be 0,002 {\AA}$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$.