Time-resolved FTIR emission spectroscopy of Cu in the 18003800 cm1 region: transitions involving f and g states and oscillator strengths

S Civiš (1) , I Matulková (1) , J Cihelka (1) , P Kubelk (1) , K Kawaguchi (2) , V E Chernov (3)

1 J. Heyrovsk Institute of Physical Chemistry
2 Faculty of Science
3 Voronezh State University

Time-resolved Fourier-transform spectroscopy was applied to the study of the emission spectra of Cu vapors in a vacuum (10 −2 Torr) produced in ablation of a Cu metal target by a high-repetition rate (1.0 kHz) pulsed nanosecond ArF laser (λ = 193 nm, output energy of 15 mJ). The time-resolved infrared emission spectrum of Cu was recorded in the 1800-3800 cm −1 spectral region with a resolution of 0.017 cm −1. The time profiles of the measured lines have maxima at 18-20 µs after a laser shot and display non-exponential decay with a decay time of 5-15 µs. This study reports 17 lines (uncertainty 0.0003-0.018 cm −1) of Cu I not previously observed. This results in 7 newly-found levels and revised energy values for 11 known levels (uncertainty 0.01-0.03 cm −1). We also calculate transition probabilities and oscillator strengths for several transitions involving the reported Cu levels.

Mots clés: Time-resolved Fourier transform infrared spectroscopy; time decay of spectral lines; Atomic ablation; Cu; Copper; Rydberg states; oscillator strengths; line strengths; dipole transition matrix elements

S Civiš, I Matulková, J Cihelka, P Kubelk, K Kawaguchi, et al.. Time-resolved FTIR emission spectroscopy of Cu in the 18003800 cm1 region: transitions involving f and g states and oscillator strengths. Journal of Physics B: Atomic, Molecular and Optical Physics, 2011, 44 (2), pp.25002. ⟨10.1088/0953-4075/44/2/025002⟩. ⟨hal-00589496⟩