Microwave optical double resonance of NO 2 with a tunable cw dye laser : Spin-rotation and hyperfine interactions in the 2B2 excited electronic state

Abstract

Various spin and hyperfine components of the 6 16 → 7 07 microwave transition in the 2 B 2 electronic excited state were observed by microwave optical double-resonance spectroscopy using a tunable cw dye laser near 593 nm. Spin splittings and the hyperfine structure of two levels were precisely determined. Spin-rotation and hyperfine interactions in the 2 B 2 state are discussed using these and the previously reported results on the 8 18 → 9 09 transition. From the hyperfine splittings of the K a = 0, N = 7 and 9 levels, a value for the Fermi contact interaction constant, (0) I , of ∼50 MHz was determined.