Cavity ring-down spectroscopy of the [formula omitted] bands of 15N substituted N 2O

Abstract

The 6 ν 3 and ν 2 + 6 ν 3 − ν 2 bands of 15N substituted nitrous oxide isotopologues have been recorded by a continuous-wave cavity ring-down spectrometer (CW-CRDS) operated near 0.8 μ m . The sensitivity limit was at the level of 1 × 10 − 10 / cm . In total, 213, 86 and 191 transitions were observed for the 14N 15N 16O, 15N 14N 16O and 15N 2 16O isotopologues, respectively. The ro-vibrational spectroscopic parameters of the upper states are determined from least square fitting of the transitions. The absolute line intensities of the 6 ν 3 cold bands have been retrieved by a multi-line fitting procedure from the spectra with an estimated accuracy of 4% for majority of the unblended lines. The vibrational transition dipole moment squared values and the empirical Herman–Wallis coefficients are also presented.