F. Michaud

High-resolution Fourier spectrometry of the CO infrared emission spectrum: Perturbation analysis of the a′ 3Σ-a3Π system

Abstract The strongly perturbed a′ 3 Σ -a 3 Π system of CO was recorded under high resolution with a Fourier transform interferometer. Rotational perturbations observed in the a′ 3 Σ v = 0, 1, 3 levels, due to an interaction with high levels of the a state, were completely reduced. The treatment required a theoretical model which takes into account an off-diagonal spin-spin parameter and the centrifugal distortion of off-diagonal interactions between 3Π and 3Σ states.

High-resolution Fourier spectrometry of N2+

A new perturbation analysis of the first negative system B(2)Σ(u)(+) ? X(2)Σ(g)(+) of the (14)N(2)(+) ion is performed based on spectra excited both at low and high temperatures by the use of either a hollow-cathode or a Pointolite lamp. Preliminary results are given for a deperturbation of the B(2)Σ(u)(+) (ν = 0, ν = 1) levels. Deperturbed molecular constants and parameters that describe the B(2)Σ(u)(+) ~ A(2)∏(u) interaction are derived.

New analysis of the perturbation of the C2 Ballik-Ramsay system from high-resolution Fourier spectrometry

Abstract The b 3 Σ g − - a 3 Π u Ballik-Ramsay system of C 2 perturbed by the 1 Σ g + state was previously partially deperturbed. Therefore, errors were made in the assignment of lines around the perturbation. In this work, the perturbations observed in the b 3 Σ g − − v = 0, 1, 2, and 3 levels were completely reduced. The treatment required a theoretical model which includes secondorder terms in the off-diagonal interactions.

Extended analysis of the B′3Σu−-B3Πg and B3Πg-A3Σu+ systems of 15N2 by high resolution Fourier spectroscopy

Abstract Rotational analysis of the First Positive system and the Y band system have been extended to include the levels v = 10, v = 9, and v = 6 of the B 3 Π g , A 3 Σ u + , B ′ 3 Σ u − states, respectively. The molecular parameters of these states are obtained from a fitting procedure. Equilibrium constants are deduced from these and Franck-Condon factors are calculated for the B → A and B ′ → B transitions of 15 N 2 .