CAVITY RING-DOWN LASER ABSORPTION SPECTROSCOPY OF YTTRIUM AND NICKEL MONOIODIDES
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Date
2005
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Publisher
Ohio State University
Abstract
The absorption spectra of yttrium and nickel monoiodides at vwavelength between 445-510 nm have been investigated using the technique of laser vaproization/reaction with free-jet expansion of cavity ring-down laser absorption (CRLA) spectroscopy. Yttrium monoiodide molecule was produced by reacting laser-ablated yttrium or nickel atoms and methyl iodide seeded in helium. For the YI molecule, several bands of the $D^1\Pi-X^1\Sigma^+$ transition were observed and vibrational levels were analyzed. For NiI, two new transition systems were recorded and analyzed, namely the [21.3] $^2 Delta _{5/2} - X^2 \Delta_{5/2}$ and [21.9] $^2 Delta _{3/2} - X^2 \Delta_{5/2}$ system. Spectra of both $^{58}$NiI and $^{60}$NiI isotopic molecules were observed. Equilibrium molecular constants for both electronic states are reported and the equilibrium bond length was respectively determined to be 2.431\AA for the [21.3]$^2\Delta_{5/2}$ state and 2.481\AA for the [21.9]$^2\Pi_{3/2}$ state.
Description
Author Institution: Department of Chemistry. The University Hong Kong, Pokfulam; Road, Hong Kong.