INFRARED LASER VELOCITY MODULATION SPECTROSCOPY OF $SiCl^{+} (X^{1}\Sigma^{+})$ UP TO $V=6$

Abstract

Many fundamental and hot band absorption lines of $^{28}Si^{35}Cl^{+}, {^{28}}Si^{37}Cl^{+}, {^{29}}Si^{35}C^{+}$ and $^{30}Si^{35}Cl^{+}$ have been detected between 630 and $700 cm^{-1}$ in a $SiCl_{4}$/He ac discharge using diode laser velocity modulation spectroscopy. The data have been fitted to give mass independent coefficients $U_{kl}$. The derived spectroscopic constants for $^{28}Si^{35}Cl^{+}$ include $\omega_{e} = 678.24316(18) cm^{-1}$ and $B_{e} = 0.2870288(14) cm^{-1}$. The equilibrium internuclear distance is $r_{c}=1.9439105(46){\AA}$. The equilibrium dissociation energy calculated from the expanded Dunham-Morse potential is $D_{e}=49431(57)cm^{-1}$.