New rotational line strengths for the C2 Swan system ( d Π g 3 – a Π u 3 ) have been calculated for vibrational bands with v ′ = 0 – 10 and v ″ = 0 – 9 , and J values up to J=34–96, using previous observations in 33 vibrational bands. Line positions from several sources were combined with the results from recent deperturbation studies of the v ′ = 4 and v ′ = 6 levels, and a weighted global least squares fit was performed. The updated molecular constants are reported. The line strengths are based on a recent ab initio calculation of the transition dipole moment function. A line list has been made available, including observed and calculated line positions, Einstein A coefficients and oscillator strengths (f-values). The line list will be useful for astronomers, combustion scientists and materials scientists who utilize C2 Swan spectra. Einstein A coefficients and f-values were also calculated for the vibrational bands of the Swan system.

Line strengths and updated molecular constants for the C2 Swan system

A complete set of experimental vibrational band transition probabilities, including recent measurements on v′=2 and 3, allows us to calculate an empirical electronic transition moment, Re(r), for the A 2Σ+−X 2Πi system of OH, over the range of internuclear distance 070–170 A A comparison with an ab initio moment confirms that theoretical shape and validates its quantitative results, as the calculated Re(r) is within experimental uncertainty of the present result The experimentally derived Re(r) is used along with Rydberg–Klein–Rees (RKR) wave functions to calculate transition probabilities for a wide range of vibrational and rotational levels The study is extended to the isotope OD

Transition probabilities in the A 2Σ+−X 2Πi electronic system of OH

The infrared emission spectrum of NO: Analysis of the Δv = 3 sequence up to v = 22

The spectroscopic and kinetic properties of different electronic states of C 2 are reviewed. Special emphasis is given to the work in which the formation and study of C 2 states involve photochemical or chemiluminescent processes.

J. Chauville

Papers

Fourier spectroscopy of the OD infrared spectrum. Merge of electronic, vibration-rotation, and microwave spectroscopic data

New analysis of the C2 Ballik-Ramsay system from flame emission spectra

Fourier spectroscopy of the hydroxyl-d radical infrared spectrum. merge of electronic, vibration-rotation, and microwave spectroscopic data