HIGH RESOLUTION LASER SPECTROSCOPY OF THE NITRIC OXIDE DIMER IN SUPERFLUID HELIUM NANODROPLETS
Mischenko, Daniel
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https://hdl.handle.net/2142/122431
Description
Title
HIGH RESOLUTION LASER SPECTROSCOPY OF THE NITRIC OXIDE DIMER IN SUPERFLUID HELIUM NANODROPLETS
Author(s)
Mischenko, Daniel
Contributor(s)
Raston, Paul
Issue Date
2023-06-23
Keyword(s)
Non-covalent interactions
Abstract
Previously, the ν₁ and ν₅ bands of helium solvated nitric oxide clusters were investigated with a pulsed OPO system having a resolution of 0.25 cm⁻¹. Here, we investigated the ν₁ band with a continuous-wave quantum cascade laser at high resolution (10 MHz), and uncover substructure that provides additional insight. In particular, in the vicinity of the fundamental band of the nitric oxide dimer, we observed baseline-resolved rotational substructure with relative intensities that are consistent with the cis-(ON-NO) isomer, along with a weaker band with similar substructure shifted slightly to lower frequencies. We tentatively attribute this weaker band to an anharmonic resonance between the fundamental and a combination band (which could be, e.g., 4ν₆ + ν₃), although we cannot rule out that it is due to the higher energy triplet nitric oxide dimer.
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