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Theoretical model of the coherent control of nuclear spin isomers bymicrowave radiation has been developed. Model accounts the M-degeneracy ofmolecular states and molecular center-of-mass motion. The model has beenapplied to the 13CH3F molecules. Microwave radiation excites the para state(J=11,K=1) which is mixed by the nuclear spin-spin interaction with the orthostate (9,3). Dependencies of the isomer enrichment and conversion rates on theradiation frequency have been calculated. Both spectra consist of tworesonances situated at the centers of allowed and forbidden (by nuclear spin)transitions in the molecule. Larger enrichment, up to 7%, can be produced bystrong radiation resonant to the forbidden transition. The spin conversion ratecan be increased by 2 orders of magnitude at this resonance.Comment: REVTEX, 14 pages + 6 eps figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Theoretical model for enrichment of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CH</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:math>nuclear-spin isomers by resonant microwave radiation

Theoretical model for enrichment ofCH3Fnuclear-spin isomers by resonant microwave radiation