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Nitric oxide (NO) radicals in the a 4 Π state were produced by discharging the mixture of NO gas and helium at the audio frequency. In the near infrared region, the spectra of the b 4 Σ − - a 4 Π system of the NO radical were studied by optical heterodyne - concentration modulation laser absorption spectroscopy. More than one hundred and thirty lines and eleven branches were recorded for the first time and assigned to the (3, 0) band. A global fitting was carried out to extract the molecular constants. In particular, the parameters D , p , γ and A D were precisely determined. [ABSTRACT FROM AUTHOR]

Abstract: The spectra of d 3Δ–a 3П (7,1) band of CS radical were measured by optical heterodyne–concentration modulation spectroscopy in the region from 11640 to 12230cm−1. In total, we assigned three hundred and four lines, of which Ree and Rff branches in the d 3Δ1–a 3П0 subsystem and more than a hundred lines were first observed and identified. The anomalous lambda-doubling of the d 3Δ1 (υ =7) level reveals a local perturbation interaction from the 1Σ− state. The perturbation parameter between 1Σ− and a 3П0 (υ =13), and molecular constants of the d 3Δ1 (υ =7) as well as 1Σ− were derived through fitting all assigned lines to the effective Hamiltonian. [Copyright &y& Elsevier]