Vol. 38, issue 11, article # 2

Abstract:

In this work, the analysis of the recorded spectrum of the ¹⁵N¹⁸O molecule in the region 5100–5500 cm^-1 was performed. As a result of the analysis, 187 positions of rotational lines in the vibrational band 3–0 of the main transitions between the electronic states ^2∏_1/2 and ²Π_3/2 with the maximal rotational quantum number J = 32.5 were found. For the first time, Λ-splitting was observed in this band. The positions and relative intensities of both the resolved component of the Λ-doublets and unresolved doublets are determined. A joint weighted processing of all known vibrational-rotational frequencies of the transitions in the microwave and infrared spectral regions was carried out. As a result of the processing, “Dunham-type" constants for ¹⁵N¹⁸O isotopologue in the ground electronic state were determined. Using the found “Dunham-type" constants, predictive calculations of the rotational line positions of all bands corresponding to vibrational transitions between states with v ≤ 3 and J ≤ 37.5 were carried out.

Keywords:

15N18O isotopologue, experimental spectrum, vibration band 3–0, transition frequency, relative intensity, Dunhem type constant

Figures:

References:

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