Laser Stark spectroscopy of the fundamental bands of HNO (ν2 and ν3) and DNO (ν1 and ν2)

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Abstract
The ν2 (N–O stretch) fundamental bands of HNO and DNO and the ν3 (bending) band of HNO in the 6.5 μm region have been studied using the technique of laser Stark spectroscopy. The experiment utilized a Stark cell located inside the cavity of a CO laser, with the short‐lived HNO molecules produced in a flow system by the reaction H+NO→HNO. Accurate values for the band origins, rotational constants, and dipole moments were obtained from analyses of 35 transitions in DNO and over 40 in HNO. The Coriolis interaction between the close‐lying ν2 and ν3 states of HNO was explicitly included in the analysis, enabling a value for the Coriolis interaction parameter to be derived. A few transitions in the ν1 (N–D stretch) band of DNO near 5 μm were also detected from which a tentative value of the band origin was estimated.

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