Stark Spectroscopy with the CO Laser: Dipole Moments, Hyperfine Structure, and Level Crossing Effects in the Fundamental Band of NO

Abstract

The 9–8 P(13) line of the ¹²C¹⁶O laser (1884.349 cm⁻¹) has been used to study laser Stark Lamb dip spectra associated with the R(3/2) line of the rotation–vibration fundamental band of NO. We have observed fully resolved hyperfine structure (line width ≈ 500 kHz) due to both components, Ω = 3/2 and 1/2, of the ²Π ground state. In addition, two level crossing signals have been observed in the v = 1 vibrational state of the ²Π_1/2 component. The values we obtain for the electric dipole moment (in Debye) are:[Formula: see text]It was possible to determine μ′ and μ″ separately for the ²Π_1/2 component because of the observation of the level crossing signals, which depend only on μ′. Our result for μ″ of ²Π_1/2 agrees, within error limits, with a more precise previous measurement by molecular beam techniques, and our other results are more precise than previous determinations based on infrared intensities.