Quadrupole Splittings in the near-infrared spectrum of $^{14}$NH$_3$

23 Sep 2016 Twagirayezu Sylvestre Hall Gregory E. Sears Trevor J.

Sub-Doppler, saturation dip, spectra of lines in the $v_1 + v_3$, $v_1 + 2v_4$ and $v_3 + 2v_4$ bands of $^{14}$NH$_3$ have been measured by frequency comb-referenced diode laser absorption spectroscopy. The observed spectral line widths are dominated by transit time broadening, but show resolved or partially-resolved hyperfine splittings that are primarily determined by the $^{14}$N quadrupole coupling... (read more)

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