THE ROLE OF Hg 6<sup>3</sup><i>P</i><sub>0</sub> ATOMS IN MERCURY PHOTOSENSITIZATION. I. REACTIONS IN THE PRESENCE OF NITROGEN

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<jats:p> A quantitative investigation has been made of the factors affecting the concentration of mercury 6<jats:sup>3</jats:sup>P<jats:sub>0</jats:sub> atoms formed by collisions of the second kind between mercury 6<jats:sup>3</jats:sup>P<jats:sub>1</jats:sub> atoms and nitrogen. The absorption of 4047 Å (6<jats:sup>3</jats:sup>P<jats:sub>0</jats:sub> − 7<jats:sup>3</jats:sup>S<jats:sub>1</jats:sub>) and the emission of 2656 Å (6<jats:sup>3</jats:sup>P<jats:sub>0</jats:sub> − 6<jats:sup>1</jats:sup>S<jats:sub>0</jats:sub>) were studied in the pressure range 0.06 mm to 140 mm. Both types of measurement indicate that the forbidden line arises from spontaneous as well as collision-induced emission. The lifetime for spontaneous emission is estimated to be 4.2 × 10<jats:sup>−4</jats:sup> sec. </jats:p>

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