Laser Spectroscopy of NiI: New Electronic States and Hyperfine Structure

Details Laser Spectroscopy of NiI: New Electronic States and Hyperfine Structure Laser Spectroscopy of NiI: New Electronic States and Hyperfine Structure

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..conferf06c&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

Physics

Electronic

Scientific paper

Two new electronic transition systems of NiI namely: the [14.0] ^2Φ_{7/2}
- X^2Δ_{5/2}? and the [15.7] ^2Δ_{5/2}? - X^2Δ_{5/2}? transitions were observed and analyzed using laser vaporization/reaction supersonic free jet expansion and high resolution laser induced fluorescence spectroscopy. In addition, the (v, 0) bands with v = 6 - 10 of the previously identified [14.6] ^2Δ_{5/2}?? - X^2Δ_{5/2} transition were found to be perturbed by the [15.7] ^2Δ_{5/2}?? state. All observed spectra show partially resolved hyperfine structure. Hyperfine width of rotational lines decreases rapidly as J increases suggested that the hyperfine structure for the [14.0] ^2Φ_{7/2}, the [14.6] ^2Δ_{5/2}? and the [15.7] ^2Δ_{5/2}? states conform to the Hund's case a_β coupling scheme. The interaction between the [14.6] ^2Δ_{5/2}? and the [15.7] ^2Δ_{5/2}? states is evident in the progressive increase in hyperfine width in rotational lines of the [14.6] ^2Δ_{5/2}? - X^2Δ_{5/2} transition as the vibrational quantum number increases. Deperturbation procedures were successfully applied to analyze the interaction between these two states. Accurate molecular and hyperfine constants for the [14.0] ^2Φ_{7/2}?, the [14.6] ^2Δ_{5/2}? and the [15.7] ^2Δ_{5/2}?? states were obtained and interpreted.

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