Laser vaporization generation of B 14NH, B 15NH, B 14ND, B 16O, and B 17O: Electron-spin-resonance investigation in neon matrices under ultracold trapping conditions

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Abstract
Reactive laser vaporization conditions have been employed to generate various isotopic combinations of the new radical species, BNH, for neon matrix electron‐spin‐resonance (ESR) study. The BNH radical was found to have a linear geometry with an X 2Σ electronic ground state, in agreement with ab initio theoretical calculations, which were conducted as part of this experimental investigation. ESR results for the nuclear hyperfine interactions (A tensor) indicate that the electronic structure of BNH is quite similar to that of the isoelectronic BO radical. Results of a detailed reinvestigation of the 11,10B 16,17O radicals trapped in neon matrices are reported which now show excellent agreement with earlier gas‐phase microwave spectroscopic measurements of the dipolar boron hyperfine interaction. The 17O A tensor for BO has been fully resolved for the first time into its isotropic and anisotropic components. A new ultracold neon trapping procedure is described which was used to produce matrix samples of randomly oriented and nonrotating radicals in order to measure the full extent of the dipolar nuclear hyperfine interaction. The neon matrix magnetic parameters for 11B 14NH are g∥=2.0020(5) and g⊥=2.0010(5), A∥=1089(1) and A⊥=1013(1) MHz for 11B, A∥=49(1) and A⊥=37(1) MHz for 14N, and A∥=29(1) and A⊥=23(1) MHz for H.

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