Knowledge Bank

The electronic spectrum for the ion-molecule complex $Ca+-N2$ is observed using resonance enhanced photodissociation spectroscopy. The clusters are formed in a laser ablation/supersonic expansion source. The parent ions is mass selected, photodissociated on resonance and the $Ca+$ product ion is monitored as a function of wavelength via time of flight mass The observed vibrational features are assigned to the $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi 1/2\leftarrow \mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi 3/2\leftarrow \mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma$ transitions with a progression in the Ca-N stretching mode. A second progression is observed and is assigned to combinations of the $N2v=l\leftarrow 0$ stretch. The observed spectroscopic constants are: $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi 1/2\leftarrow \mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma (v21,0,0)[T0=20531cm-1,\omega e=276.6cm-1,D0=6390cm-1]$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi 3/2\leftarrow \mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma (v1,0,0)[T0=20657cm-1,\omega e=282.0cm-1,D0=5560cm-1]$; and $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi 1/2\leftarrow \mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma (v1,0,1)[T0=23018cm-1,\omega e=274.5cm-1,D0=6440cm-1];$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi 3/2\leftarrow \mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma (v+,0,1)[T0=23147cm-1,\omega e=282.1cm-1,D0=5330cm-1]$. The dissociation constant is determined to be: $D0=1726.5cm-1$.