Knowledge Bank

The entire emission spectrum of gas phase $As2$ below $32,000cm-1$ excited by microwave or high voltage discharges has been measured using a high resolution Fourier-transform spectrometer (Bruker IFS 120HR) with very sensitive Ge or InSb detectors. Its analysis yielded data on fourteen electronic band systems among the twelve electronic states: $X0g+(1\Sigma )$, $A\prime 0u-(1\Sigma u-)$, $D1g(1\Pi g)$, $a0u+(3\Sigma u-)$, $a1u(3\Sigma u-)$, $c1u(3\Sigma u+)$, $c0u-(3\Sigma u+)$, $e1u(3\Delta u)$, $e2u(3\Delta u)$, $f0g+(3\Pi g)$, $f0g-(3\Pi g)$ and $f1g(3\Pi g)$. Rather than analyze these band systems in a series of independent two-state analyses, we have performed a comprehensive combined analysis of all data sets simultaneously, using program $DSParFit.b$ Differences between the present results and those obtained from independent two-state analyses, will be discussed.