Knowledge Bank

The visible and ultraviolet electronic transitions of AgCl were recorded at high resolution with the Fourier transform spectrometer associated with the McMath-Pierce Solar Telescope at Kitt Peak, AZ. The ultraviolet system was previously observed and assigned at a $0+-X1\Sigma +$ $transition,a$ while the visible transition is a new, violet-degarded electronic system near $25,500cm-1$. A similar, violet-degarded visible transition in AgF was recently $observed,b$ and high-level ab initio $calculationsc$ on AgF have predicted that the excited state of this transition is a $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Sigma +\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ state. For the ultraviolet transition, the excited AgCl molecules were produced in a microwave discharge operated with 70 W absorbed power and at a total pressure of approximately 2 torr. For the visible system, a King-type carbon tube furnace was charged with AgCl powder and heated to 1900 C to produce the excited AgCl molecules. The molecular constants for the states involved will be presented.