Fourier transform microwave spectroscopy of LiNH2 and NaNH2 (~X1A1): Comparing quadrupole hyperfine interactions
Burton, Mark
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https://hdl.handle.net/2142/104402
Description
Title
Fourier transform microwave spectroscopy of LiNH2 and NaNH2 (~X1A1): Comparing quadrupole hyperfine interactions
Author(s)
Burton, Mark
Contributor(s)
Ziurys, Lucy M.
Sheridan, Phillip M.
Russ, Benjamin
Issue Date
2019-06-19
Keyword(s)
Metal containing
Date of Ingest
2019-07-15T22:16:51Z
2020-01-25T19:31:10Z
Abstract
Rotational spectra of LiNH$_{2}$ and NaNH$_{2}$ in their \~{X}$^{1}$A$_{1}$ ground electronic states have been recorded using pulsed-beam Fourier transform spectroscopy in the frequency range 22-58 GHz. These species were synthesized in a DC discharge by the reaction of ammonia and the respective laser-ablated alkali metal, in argon carrier gas. Observed transitions were analyzed with previously-measured millimeter-wave frequencies, improving previous rotational constants and determining the metal electric quadrupole hyperfine parameter, $\chi$$_{aa}$, for both species. We find that $\chi$$_{aa}$ (Li) = 0.494 and $\chi$$_{aa}$ (Na) = -7.688. We also compare our results to DFT calculations. A Townes-Dailey analysis of the quadrupole constants suggest that the bonding of the –NH$_{2}$ ligand to lithium and sodium is comparable.
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