General variational approach to nuclear-quadrupole coupling in rovibrational spectra of polyatomic molecules

Abstract

A general algorithm for computing the quadrupole-hyperfine effects in the rovibrational spectra of polyatomic molecules is presented for the case of ammonia (NH${}_3$). The method extends the general variational approach TROVE by adding the extra term in the Hamiltonian that describes the nuclear quadrupole coupling, with no inherent limitation on the number of quadrupolar nuclei in a molecule. We applied the new approach to compute the nitrogen-nuclear-quadrupole hyperfine structure in the rovibrational spectrum of NH${}_3$. These results agree very well with recent experimental spectroscopic data for the pure rotational transitions in the ground vibrational and ${\nu }_2$ states, and the rovibrational transitions in the ${\nu }_1$, ${\nu }_3$, $2{\nu }_4$, and ${\nu }_1+{\nu }_3$ bands. The computed hyperfine-resolved rovibrational spectrum of ammonia will be beneficial for the assignment of experimental rovibrational spectra, further detection of ammonia in interstellar space, and studies of the proton-to-electron mass variation.

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Cited by in corpus (8)

• RichMol: A general variational approach for rovibrational molecular dynamics in external electric fields
• General variational approach to nuclear-quadrupole coupling in rovibrational spectra of polyatomic molecules
• Laser-induced dynamics of molecules with strong nuclear quadrupole coupling
• A variationally computed room temperature line list for AsH${}_3$
• The effect of nuclear-quadrupole coupling in the laser induced alignment of molecules
• Hyperfine-resolved rotation-vibration line list of ammonia (NH${}_3$)
• The nuclear-spin-forbidden rovibrational transitions of water from first principles
• Self-broadening and self-shift in the $3{\nu }_2$ band of ammonia from mid-infrared-frequency-comb spectroscopy