Abstract

We report new measurements of the hyperfine spectra of BX transitions in the wavelength range 500–517 nm. Four effective hyperfine parameters, eqQB, CB, dB, and δB, are determined for an extensive number of rovibrational levels spanning the intermediate region 42v70 in the electronically excited B0u+(3u) state. Second-order perturbation accounts for most of the observed rovibrational dependence of the hyperfine interactions. In addition, it was found that, near vibrational levels v=5760, the 1g(1g) electronic state strongly perturbs the B state through rotational coincidence, leading to effects such as abnormal variations in the hyperfine parameters and strong ug mixing recorded for the transition P(84) 600. Various perturbation effects in the B state identified so far are summarized. Also, the radial dependence of the hyperfine interactions was examined by removal of the vibrational average in the hyperfine parameters.

© 2004 Optical Society of America

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