The rotational and fine-structure spectrum of FeH, studied by far-infrared laser magnetic resonance

Journal article

Transitions between the spin-rotational levels of the FeH radical in the υ=0 level of the X4Δ ground state have been detected by the technique of laser magnetic resonance at far-infrared wavelengths. Both pure rotational and fine-structure transitions have been observed; lambda-type doubling is resolved on all the observed transitions. The energy levels of FeH are strongly affected by the breakdown of the Born-Oppenheimer approximation and cannot be modeled accurately by an effective Hamiltonian. The data are therefore fitted to an empirical formula to yield term values and g factors for the various spin-rotational levels involved. Many of the resonances show a doubling that arises from the proton hyperfine structure.

Authors: Brown, J; Körsgen, H; Beaton, S; Evenson, K

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Institute of Physics
• Journal: Journal of Chemical Physics
• Volume: 124
• Issue: 23
• Article number: 234309
• Publication date: 2006-06-01
• Edition: Publisher's version
• DOI: 10.1063/1.2198843
• EISSN: 1089-7690
• ISSN: 0021-9606
• Language: English
• Keywords: fine-structure spectrum; FeH radical; rotational spectrum; laser magnetic resonance; far-infrared region
• Subjects: Chemistry & allied sciences; Physical & theoretical chemistry