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Isotopologues of the NeHCl complex observed by chirped pulse Fourier transform microwave spectroscopy
Muhammad Qasim Ali1, Arun Bhujel1, Salma Akter1
1Texas Tech University, Department of Chemistry and Biochemistry, Lubbock, Texas 79409, USA.
Abstract:
The weakly bound Ne·HCl van der Waals dimer is a prototype for studying large-amplitude motion in noncovalently bound systems. We report the microwave spectrum of eight isotopologues of Ne·HCl, five of which have not previously been observed by high-resolution spectroscopy. We examine trends in experimentally derived van der Waals stretching force constants and effective bond lengths that are strongly sensitive to isotopologue-dependent motional averaging along the hindered rotation coordinate. Finally, we report an updated semi-empirical three-dimensional morphed potential for the Ne·HCl dimer that is fitted to a large dataset including previous microwave, near-IR, and sub-millimeter wave data in addition to our new microwave data.
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