Rotational analysis of the A0 ⁺ , B0 ⁺ ← X ¹ Ʃ ⁺ systems of gaseous AgF

The absorption spectrum of AgF in the region 300.0 to 355.0 nm consists of a continuum centred at about 303.0 nm and two-band systems, A0$^{+}$ $\leftarrow $ X$^{1}$\Sigma $^{+}$ and B0$^{+}$ $\leftarrow $ X$^{1}$\Sigma $^{+}$. Rotational analyses have been made for all seven bands observed in the A-X system and of four bands in the B-X system, for both $^{107}$AgF and $^{109}$AgF. State A seems to have a very low dissociation energy and may possess only two stable vibrational levels. Lines at high J appear diffuse, indicating predissociation, perhaps by rotation. State B is also predissociated and only the bands with $\upsilon $$^{\prime}$ = 0 show sharp rotational structure. The predissociating state is probably an $\Omega $ = 1 state which is the upper state of the 303.0 nm continuum. Constants for the ground state of $^{107}$AgF are as follows: G$_{\text{v}}$ = 513.447 $\pm $ 0.009 ($\upsilon $ + $\frac{1}{2}$) - 2.593 $\pm $ 0.002 ($\upsilon $ + $\frac{1}{2}$)$^{2}$ B$_{\text{v}}$ = 0.26567 - 0.001901 $\pm $ 8 ($\upsilon $ + $\frac{1}{2}$).